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Mira 416.41

THERMAL SWITCH SPARE
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Our Price: £12.10 (inc. VAT)
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Item Number:  MIRA-416.41
Shower Doctor Competitive Pricing!
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Product Details

Specification
Thermal Switch Spare
  • Thermal switch assembly
  • Fits Mira Azora/Sprint/Sport/Zest
Important Information

***CAUTION*** 

DO NOT press the printed disc on the thermal switch before fitting as this can WILL make this component un-serviceable.

Questions and Answers
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Mira Sport 10kw 1 Answer

Q: changed tco switch , shower now heat up but orange overheat light is glowing.

Submitted 72 days ago | by roy, Nottm
! Answer this question

A: If the shower is heating up OK and the overheat light is onthat would suggest that you have connected a wire in the wrong place.

If you remembered to take photos before you started thenrefer to them, if not you will have to email Mira and ask for a wiring diagramas we don’t have wiring diagrams for showers.

Answered 72 days ago | The Doc
Mira Sport - Power and Low flow lights on but no water from head 1 Answer

Q: The shower stopped working suddenly. When the power button is pressed to start the shower the Low Flow light comes on immediately. I've relaced the Solenoid Coil and Thermal Switch in the past. Might either of these be the fault of is another part needed?

Submitted 98 days ago | by Michael, Dumfries
! Answer this question

A: It maybe your solenoid valve, you can check it if you have a multi meter, you shouldhave a reading of at least k3.5 ohms, across the two terminals any less and youneed a new valve. (Check the valve in the failed state.) (When it has stoppedworking!)

If thereis power getting to the solenoid and it is not operating then there is a goodchance that you have a faulty solenoid.

http://www.youtube.com/watch?v=NzJjzWqxesc

The video is intended as a guide and does not cover every shower.

If youdon’t have a multimeter we sell them with a guide on how to usethem for checking and testing the various parts of your shower.

Apart from helping to fix your shower, they are really useful forchecking you have a power supply to appliances, for checking fuses and lettingyou know much power you have left in batteries

(So youwill know if they are good or not) and lots of other jobs, in short they arewell worth a few pounds

http://www.showerdoc.com/installation/electrical-products/SKYTRO-600-005-Digital-Multi-Tester

Answered 98 days ago | Barrie
mira sport max 1 Answer

Q: I have a Mira Sport Max which runs hot and cold, sometimes when I press the max button it instantly goes into overheat for around 15 seconds running cold the the overheat light goes off and heat but will go into overheat again after around 1-2 minutes, could it be the TCO

Submitted 106 days ago | by lee, sunderland
! Answer this question

A: The things to check firstare:

1 That the main valve cominginto your house is fully open.

2 Then check that the valve on the line to the shower isfully open.

If these valvesare not fully open then there may not be enough water getting to your shower to cool it properly the overheatsafety device will turn the power offuntil it cools Then it all starts again. Check the inlet filter is not blocked.

Make sure that the shower head isclean and clear, that the hose isn’t kinked (this can happen just behind thehand set where it is difficult to see) also check the inside of the hosealthough it can look OK on the outside it could have collapsed internally

The other possibility is a faultyflow/stabilizer valve not allowing the correct amount of water into the shower.

A rough check is to remove theshower head turn temperature control to fully hot the water coming out of thehose should be a bit more than a dribble then turn to fully cold and it shouldbe coming out at full flow.

Ifthere is not much difference between the two then you could have a faulty flowvalve.

Carry out this checkafter you check the inlet valves.

Answered 102 days ago | Barrie
disc pressed accidentally on tco 416 1 Answer

Q: I have accidentally pressed the disc ot a new TCO 416, what shall i do to relewase this as it does not work?.

Submitted 117 days ago | by deba, birmingham
! Answer this question
A: You will need to buy a new TCO.Answered 116 days ago | Barrie
Mira sport shower 1 Answer

Q: changed soleniod coil, still no water, power light on, can it be the thermal switch?

Submitted 126 days ago | by sunnyjock, Aberdeen
! Answer this question
A: It may be the flow valve , inlet filter head or hose and these would need to be checked, also that there is actually water getting to the shower.Answered 123 days ago | Barrie
mira electric shower 1 Answer

Q: Electric Mira shower is presently running very hot or very cold. Please advise what the cost of the part and labour is?



Many thanks,



David Lawrence

Submitted 139 days ago | by David, Crouch Hill, London N4
! Answer this question

A: The things to check first are.

1 That the main valve coming into your house is fully open.

2 Then check that the valve on the line to the shower is fully open.

If these valves are not fully open then there may not be enough water
getting to your shower to cool it properly, the overheat safety devicewill turn
the power off until it cools, then it then it starts to heat again andso on.

Make sure that the shower headis clean and clear, that the hose isn’t kinked (this can happen just behind thehand set where it is difficult to see) also check the inside of the hosealthough it can look OK on the outside it could have collapsed internally

The other possibility is a faulty flow/stabilizer valve not allowingthe correct amount of water into the shower.

After you have checked the valves if that doesn’t solve the problemsend us your post code and we will see if we have anyone in your area that wecan recommend

Answered 137 days ago | The Doc
Mira sport 1 Answer

Q: Hi

I have a Mira sport shower and once turned on the temperature was fine but the shower was making a sound something like a kettle boiling so turned shower off and on again and temperature wudnt heat up again until I turned it round to the highest temperature on the dial but then the flow was really light and it's still making the boiling sound, any ideas

Submitted 173 days ago | by Nic, Belfast
! Answer this question

A: It may be afaulty element in the heating tank (there are two, three in most 10kw showers)you can check them with a multi meter you should have a reading of around12>18 ohms.

If you have power to the elements andno heat it's probably the elements, no power to the elements then it'sprobably a micro switch.

This Video may help

http://www.youtube.com/watch?v=wzPt1hsfVq4cv

If you don’t have a multimeter  wesell them at around £10 each with a link to an on line guide on how to use them for checking and testing the various partsof your shower.

Apart from helping to fix your shower,they are really useful for checking you have a power supply to appliances, forchecking fuses, letting you know much power you have left in batteries

(so you know if they are dud ornot)  and lots of other jobs, in short they are well  worth the £10.

http://www.showerdoc.com/installation/electrical-products/SKYTRO-600-005-Digital-Multi-Tester

Answered 172 days ago | The Doc
Mira Sport Max 1 Answer

Q: The water supply is OK and I have power through the thermal switch, however, there is no illumination on any of the shower controls and no water flow when any of the buttons are pressed. It failed to work immediately after taking a shower when I came to turning it on again a minute later. Please suggest which components are likely to have failed?

Submitted 187 days ago | by chippy, Hull
! Answer this question

A:

Itis likely to be the solenoid valve that is faulty, you can check it if youhave a multi meter, you should have a reading of at least k3.5 ohms, across thetwo terminals any less and you need a new valve. (Check the valve in the failedstate.) (When it has stopped working!)

If there is power getting to the solenoid and itis not operating then there is a good chance that you have a faulty solenoid.

http://www.youtube.com/watch?v=NzJjzWqxesc

The videois intended as a guide and does not cover every shower.

If you don’t have a multimeter  we sellthem  with a guide on how to use them forchecking and testing the various parts of your shower.

Apart from helping to fix your shower, they arereally useful for checking you have a power supply to appliances, for checkingfuses and letting you know much power you have left in batteries

(So you will know if they are good or not) andlots of other jobs, in short they are well worth a few pounds

http://www.showerdoc.com/installation/electrical-products/SKYTRO-600-005-Digital-Multi-Tester

If it is the solenoid that is faulty our advicewould be to replace the floe valve completely the solenoid comes as part of theflow valve and involves the same amount of work to replace.

Answered 186 days ago | The Doc
Mira sport 1 Answer

Q: The water does not heat up at all, everything else seems to be working, do you have any suggestions for a fix.

Submitted 290 days ago | by Rae68, Yeovil
! Answer this question

A: If the showeris absolutely cold then I think you may have a faulty Thermal Cut Out
A faulty TCO will have no continuity across the two terminals (Theblack thing on top of the heating tank)
Therefore agood TCO will have power at both connections and a faulty TCO will have power atonly one.
(The function of the TCO is, if thewater over heats it cuts the power off to the elements)

SeeVideo.

http://www.youtube.com/user/showerdoc#p/u/2/_zi8JbEMYMs

If there is some heat it may be a faultyelement in the heating tank (there are two, three in most 10kw showers) you cancheck them with a multi meter you should have a reading of around 12>18 ohms.

If you have power to the elements and noheat it's probably the elements, no power to the elements then it'sprobably a micro switch.

If you don’t have a multimeter we sell themat £10 each with a guide on how to use them for checking and testing the variousparts of your shower.

Apart from helping to fix your shower, theyare really useful for checking you have a power supply to appliances, forchecking fuses, letting you know much power you have left in batteries

(so you know if they aredud or not) and lots of other jobs, in short they are well worth the £10.

http://www.showerdoc.com/installation/electrical-products/SKYTRO-600-005-Digital-Multi-Tester

Answered 290 days ago | Barrie
Repeated TCO failure 3 Answers

Q: Great site with good advice - diagnosed the original fault (TCO failure) & got replacement part quickly. However, after fitting the new TCO, it appears to have failed again in the same manner. I've checked the other possible problems as detailed here - the flow valve seems to be working ok and there is no 'boiling' after switch off. (This is a Mira Sport, which seems to switch off the elements and allow the water to continue running for a few seconds when the 'off' switch is pressed, so I know the elements are definitely cooling down ok.)



What could be the reason for the new TCO failing so soon after installation? Is there a reasonable failure rate on this part, or would it be pretty rare for a new one to fail? There don't appear to be any leaks into the shower or anything.



Thanks for your help.

Submitted 367 days ago | by Rob P, Oxford
! Answer this question
A: Oops! just noticed that this has been answered twice!Answered 367 days ago | The Doc

A:

You have probably read this before however.....

I think a micro switch is stuck in the on position, this is keeping one of the elements energised after you have switched off the shower will keep heating and perhaps boil off some of the water inside, until the Thermal Cur Out (TCO) cuts the power off to the elements, when the shower cools down the TCO will allow the power back to the elements and the whole process starts again.

You will have to trace which switch is causing the problem and replace it. (On some showers the switch is part of a sub assembly therefore the complete assembly will need replaced)

Until you get the switch replaced switch the shower on and off using the isolator switch (pull cord)

TCO’s in general very seldom fail unless the shower has been overheating and if a new one is faulty it basically just doesn’t work from the word go.

I have checked back and we have had no faulty returns for this part since the beginning of the year.

Answered 367 days ago | The Doc
You would need to test if there is still power getting across the TCO when the shower is  switched off. If so then you may have a faulty micro switch, if thisis the case replace the faulty switch or relay and make sure that you switch theshower off at the isolating switch when the shower is not in use because thismay cause the new TCO to fail.
A: Alos when fitting a new TCO make sure you do not press the bottom.Answered 367 days ago | Barrie
Mira elite 2 1 Answer

Q: Hi guys a friend has ask me to have a look at his shower the fault is shower will run fine for 5 minutes or so then gos cold then heats again then cold again and so on I have cleaned shower filter , head and hose of all lime scale there really wasn't that much as he has a hard water filter all electrical connections same fine good power supply and good water supply do you think the problem lies with the thermal switch or another fault any help would be much appreciated

Submitted 374 days ago | by Shevers, Unknown
! Answer this question

A: The things to check first are:

1 That the main valve coming into your house is fully open.

2 Then check that the valve on the line to the shower is fully open.

If these valves are not fully open then there may not be enough water getting to your shower to cool it properly the overheat safety device will turn the power off until it cools Then it all starts again

Make sure that the shower head is clean and clear, that the hose isn’t kinked (this can happen just behind the hand set where it is difficult to see) also check the inside of the hose although it can look OK on the outside it could have collapsed internally

The other possibility is a faulty flow/stabilizer valve not allowing the correct amount of water into the shower.

A rough check is to remove the shower head turn temperature control to fully hot the water coming out of the hose should be a bit more than a dribble then turn to fully cold and it should be coming out at full flow.

If there is not much difference between the two then you could have a faulty flow valve.

Carry out this check after you check the inlet valves.

Answered 374 days ago | Anonymous
TCS Failure and Heater Tank Corrosion 1 Answer

Q: Hi Shower Doc



Great site and thanks for useful tips about diagnosis of a faulty thermal switch.



Our shower only produces cold water and in line with your instructions I have proven the TCS to be faulty.



However, before I go ahead a buy just the TCS I wanted to ask if the corrosion which was present on the switch and on the top of the Heater Tank is to be expected for a shower of about 8 years old (model is Mira Sport 10.8 KW).



I've attached some images of the Heater Tank and switch base and would be grateful for any advice.



Thanks



Neil

Submitted 406 days ago | by Neil, Isle of Wight
! Answer this question
Mira Sprint 8.5 white 2011, Cold water after 10 seconds 1 Answer

Q: My Mira sprint 8.5 white shower is 18 months old and the flow is fine. There is hot water coming out of the shower head for 10 to 15 seconds then without notice turns freezing cold and stays cold. If i turn the unit off and back on i get another 10-15 seconds of lovely hot water then freezing once more. What is wrong with this unit and how can i fix it please?

Many thanks

John

Submitted 439 days ago | by John, Nottingham
! Answer this question

A: The things to check first are.

1 That the main valve coming into your house is fully open.

2 Then check that the valve on the line to the shower is fully open.

If these valves are not fully open then there may not be enough water
getting to your shower to open / close the safety device that allows power through to the elements

Make sure that the shower head is clean and clear.

If all the above is OK then contact Mira this shower has a 2 year guarantee if you start to fiddle with it, it may invalidate your guarantee.

http://www.mirashowers.co.uk/onlinecatalog/detail.htm?productNumber=1.0.419.32.1&section=Electric

Answered 438 days ago | The Doc
fitting of thermal switch 1 Answer

Q: do i have to disconnect water feed to fit a new thermal switch

Submitted 562 days ago | by davflcnr, Unknown
! Answer this question
A: Depending on the shower, it is sometimes easy to remove the TCO without removing anything else or turning the water off.Answered 562 days ago | Barrie
mira sport 1 Answer

Q: Hi i have cold water only on my Mira Sport post 2006.

I have tested the TCO and 2 elements. (as utube vid)

I have continuity at TCO and 12ohms at both elements.

Is it TCO or micro switch(as your part detail no 8 or 9). Great Site

Thanks in advance

Ian

Submitted 582 days ago | by Ian, North Warks
! Answer this question

A: The things to check first are:

1 That the main valve coming into your house is fully open.

2 Then check that the valve on the line to the shower is fully open.

If these valves are not fully open then there may not be enough water getting to your shower.

Make sure that the shower head is clean and clear, that the hose isn’t kinked (this can happen just behind the hand set where it is difficult to see) also check the inside of the hose although it can look OK on the outside it could have collapsed internally

The other possibility is a faulty flow/stabilizer valve not allowing the correct amount of water into the shower.

A rough check is to remove the shower head turn temperature control to fully hot the water coming out of the hose should be a bit more than a dribble then turn to fully cold and it should be coming out at full flow.

If there is not much difference between the two then you could have a faulty flow valve.

Carry out this check after you check the inlet valves.

Answered 582 days ago | Barrie
continuous tco failure 1 Answer

Q: Hi,i have replaced the tco three times now,lasts only a month.The tco is completely destroyed each time with liquid leaking out of the switch and the thin strip of metal very corroded.There is no water leakage within the shower.Any ideas before i invest in a new shower as there is obviously something amiss.Incidentally i came across another post on another site with these exact symptoms but no diagnosis

Submitted 619 days ago | by loopy, west midlands
! Answer this question
There are no liquid parts in a TCO. If you have liquid "coming out" of or near the TCO then it is coming from somewhere else. Check that there is no water getting into the shower especially from the top screw holes.
A:

 The most common cause is a switch sticking in the on position.....See below

After fitting a new TCO

When fitting a new TCO listen to the shower, after it has completed its first on/off cycle, if when it is switched off you hear it continuing to heat (Noise like a kettle starting to boil) this will mean that there is a switch or a relay that is stuck in the on position, this is keeping an element energised and this is probably what caused the original TCO to fail.

If this is the case replace the faulty switch or relay and make sure that you switch the shower off at the isolating switch when the shower is not in use because this may cause the new TCO to fail.


Answered 619 days ago | Barrie
Corrosion to top of tank left by thermal switch 1 Answer

Q: Excellent site. All the tips have been very useful & I have already recommended the site. I just need to know the best way to clean off the remaining verdigris on the copper tank top. Small amount remained after cleaning off the white crystal deposits following removal the old corroded thermal switch. I don't want to use anything that may leave a deposit that will damage the new thermal switch.

Submitted 631 days ago | by Project, Nottinghamshire
! Answer this question

A: I would just use Jif or something, however it normally isn’t anything to worry about, it is usually caused by the flux residue when the heater elements are brazed into the top of the tank.

Answered 630 days ago | The Doc
Mira sport 1 Answer

Q: Does the 10.8kw shower have a hot and cold feed

Submitted 632 days ago | by mary, Unknown
! Answer this question
A: No. Electric showers such as this one usually run of the mains water feed.Answered 632 days ago | Barrie
TCO failure 1 Answer

Q: My TCO switch failed (tested using a continuity test), got a new switch and successfully replaced & shower working - for now. BUT - why did it fail in the first place? What are possible root-causes? I'm on tenterhooks waiting for it to fail again!

Submitted 652 days ago | by cryhavoc, Scotland
! Answer this question

A: Sometimes they just fail!

However the most common cause is a switch sticking in the onposition.....See below

After fitting a new TCO

When fitting a new TCO listen to the shower, after it hascompleted its first on/off cycle, if when it is switched off you hear itcontinuing to heat (Noise like a kettle starting to boil) this will mean thatthere is a switch or a relay that is stuck in the on position, this is keepingan element energised and this is probably what caused the original TCO to fail.

If this is the case replace the faulty switch or relay andmake sure that you switch the shower off at the isolating switch when theshower is not in use because this may cause the new TCO to fail.

Answered 652 days ago | The Doc
mira sport 1 Answer

Q: Could you please tell me where the two black wires coming from the PCB assembly are to be connected on a mira sport 10.8kW. Thanks

Submitted 657 days ago | by willie, western isles
! Answer this question

A: They may be connected to the on / off switch, however you don’t mention which model of Sport you have, so I can’t be sure.

Also unfortunately we do not have wiring diagrams for showers, perhaps the best place to go for a wiring diagram would be direct to Mira  

Answered 655 days ago | The Doc
No Heat from shower Mira sport 1 Answer

Q: I have good flow when on cold and less pressure on full hot.

Until recently the best compromise for hot water was about half way on the dial. Now even on full hot, the water is now luke warm.. Whats gone wrong and what needs to be replaced to give us heat back in our shower..

Submitted 671 days ago | by simboy, Midlothian
! Answer this question

A: It may be a faultyelement in the heating tank (there are two, three in most 10kw showers) you cancheck them with a multi meter you should have a reading of around 12>18ohms.

If you have power to the elementsand no heat it's probably the elements, no power to the elements thenit's probably a micro switch.

If you don’t have amultimeter  we sell them at £10 each with a guide on how to use them forchecking and testing the various parts of your shower.

Apart from helping to fix yourshower, they are really useful for checking you have a power supply toappliances, for checking fuses, letting you know much power you have left inbatteries

(so you know if they are dud ornot)  and lots of other jobs, in short they are well  worth the £10.

http://www.showerdoc.com/installation/electrical-products/SKYTRO-600-005-Digital-Multi-Tester

Answered 669 days ago | The Doc
Myra elite 1 Answer

Q: Water still running when shower is turned off

Submitted 679 days ago | by dave, Co Mayo Irelamd
! Answer this question

A: It maybe your solenoid valve, you can check it if you have a multi meter, you shouldhave a reading of at least k3.5 ohms, across the two terminals any less and youneed a new valve. (Check the valve in the failed state.) (When it has stoppedworking!)

If thereis power getting to the solenoid and it is not operating then there is a goodchance that you have a faulty solenoid.

http://www.youtube.com/watch?v=NzJjzWqxesc

The video is intended as a guide and does not cover every shower.

If youdon’t have a multimeter we sell them with a guide on how to usethem for checking and testing the various parts of your shower.

Apart from helping to fix your shower, they are really useful forchecking you have a power supply to appliances, for checking fuses and lettingyou know much power you have left in batteries

(So youwill know if they are good or not) and lots of other jobs, in short they arewell worth a few pounds

http://www.showerdoc.com/installation/electrical-products/SKYTRO-600-005-Digital-Multi-Tester

Answered 679 days ago | Barrie
Shower either red hot or freezing cold no in between 1 Answer

Q: Hi I have a Mira sprint think it's the 8.5 that either gets really hot so you turn it down the it's freezing and the low flow light comes on just wondering what it could be thanks karl

Submitted 692 days ago | by Krazykarl19, Boackpool
! Answer this question
A: Forgetting about the temperature turn the shower from fully hot to fully cold at fully hot you should have not much more than a dribble coming from the hose and on fully cold you should have a good strong flow, if you do not have this difference then you may have a faulty flow/stabilizer valveAnswered 690 days ago | Barrie
Mira sprint Shower unit hot & cold unable to control temp 1 Answer

Q: Hello shower doctor

My Mira sprint shower unit (not sure of the power) keeps on going really hot and cold. I am unable to control the temperature. It just recently started to happening.

Can you please help!

Submitted 695 days ago | by Simon, Wolverhampton
! Answer this question
Depending on the age of the shower, the problem is either the Pilot valve -post 1999 or the flow valve -post 2000. You can test this,
A:

Forgetting about the temperature turn the shower from fully hot to fully cold at fully hot you should have not much more than a dribble coming from the hose and on fully cold you should have a good strong flow, if you do not have this difference then you may have a faulty flow/stabilizer valve.

Answered 695 days ago | Barrie
Reset thermal switch 1 Answer

Q: How do you reset the switch

Submitted 810 days ago | by G Top, Unknown
! Answer this question

A: Weare having a problem at the moment with our ticketing system it is runningwords together, we have people working on it!!

Iam afraid you can’t reset the thermal switch it needs to be replaced.

Answered 809 days ago | The doc
cold water 1 Answer

Q: the water out of the shower will not heat up

Submitted 814 days ago | by jack, Unknown
! Answer this question

A: If the shower is absolutely cold then I thinkyou may have a faulty Thermal Cut Out
A faulty TCO will have no continuity across the two terminals(The black thing on top of the heating tank)
Therefore a good TCO will have power at both connections and afaulty TCO will have power at only one.
(The function of the TCO is, if the water over heats it cuts thepower off to the elements)

See Video.

http://www.youtube.com/user/showerdoc#p/u/2/_zi8JbEMYMs

Ifthere is some heat it may be a faulty element in the heating tank (there aretwo, three in most 10kw showers) you can check them with a multi meter youshould have a reading of around 12>18 ohms.

If you have power to theelements and no heat it's probably the elements, no power to theelements then it's probably a micro switch.

If you don’t have a multimeter we sell them at £10 each with a guide on how to use them for checking andtesting the various parts of your shower.

Apart from helping to fix yourshower, they are really useful for checking you have a power supply toappliances, for checking fuses, letting you know much power you have left inbatteries

(so you know if they are dud ornot)  and lots of other jobs, in short they are well  worth the £10.

http://www.showerdoc.com/installation/electrical-products/SKYTRO-600-005-Digital-Multi-Tester

Answered 813 days ago | The doc
mira shower 8.5 cool 1 Answer

Q: My Mira shower 8.5 runs cold then if turned to the end of the red will sometimes go hot again, the low flow light has come on on a couple of occassions, why is this

Submitted 818 days ago | by Anonymous, Unknown
! Answer this question

A: The things to check first are.

1 That the main valve coming into your house is fully open.

2 Then check that the valve on the line to the shower is fully open.

If these valves are not fully open then there may not be enough water
getting to your shower to open / close the safety device that allowspower through to the elements

You don’t mention which showeryou have however the other possibility is a faulty pilot or flow valve

Answered 816 days ago | The doc
Thermal switch 1 Answer

Q: cold water coming through shower overheat light on hot setting same fault as 6months ago when i purchased a new thermal switch from you has worked fine for the 6 months have i got a faulty part and is it under guarantee

Submitted 818 days ago | by smithy, Northumberland
! Answer this question

A: If when the shower was switched off did you hear itcontinuing to heat (Noise like a kettle starting to boil) this will mean thatthere is a switch or a relay that is stuck in the on position, this is keepingan element energised and this is probably what caused the original and the new TCOto fail.

It would unusual for a new TCO to fail for no reason.

If you heard no noises coming from the shower then we will replacethe TCO, however we will test the original TCO when it is returned.

If you do wish to return it please send me your invoicenumber and contact details to gt(at)showerdoc.co.uk

Answered 816 days ago | tHE DOC
sport 9 - white paste underside tco when remove 1 Answer

Q: Issue = no H/W; flowLEDoff; ~13.4ohms on 2 back Neutral posts to each of 2 front posts of tank. (Assume this OK?)



(1) How test 2 microswitches (872.01,28) ?



(2) Or how test flow and switch assemblies (1563.507,509) ?



(3) Continuity on installed TCO gives none. Take TCO off and now says ok!

Being confused I look top of tank where TCO sits and 3/4mm dia blob of white grainy paste. I thought thermal conductive paste (like on PC cpu to heatsink). Then notice on underside of TCO the disc pushes into TCO body. Pushed in and loose continuity and at rest gain continuity. I surmise that paste is some sort of buildup? I'll just clean TCO and tank top and reassemble.



(4) But... HOW does heat from tank top cause this disc to move upwards into TCO causing loss of continuity/power cut off?

I was expecting sort of bi-metallic sort of heat sensing setup...



Think need your comments.



Thanks in advance.

Tim



PS. Greeeate site and loads of food for thought - you people really make your biz the place to buy goodies... :)

Submitted 906 days ago | by timal, Bournemouth,Dorset
! Answer this question

A: Issue = no H/W;flowLEDoff; ~13.4ohms on 2 back Neutral posts to each of 2 front posts of tank.(Assume this OK?)

Sounds OK

 

How test 2 microswitches(872.01,28) ?

Check for continuity, push button in continuity let button gono continuity

Or how test flow

Rough check turn flow up and downthe flow should modulate.

and switch assemblies(1563.507,509) ?

See 1 Above

(3) Continuity oninstalled TCO gives none.

= TCO faulty

Take TCO off and now saysok!

Can’t explain that! Unless it has something to do withthe “paste”

Being confused I look topof tank where TCO sits and 3/4mm dia blob of white grainy paste. I thoughtthermal conductive paste (like on PC cpu to heatsink).

No thermal transfer paste used onthis unit, more likely to be residual flux that wasn’t cleaned away.

Then notice on undersideof TCO the disc pushes into TCO body.

This is correct

Pushed in and loosecontinuity and at rest gain continuity.

Pushing the bi-metallic disc inis the best way to damage a TCO!

 

I surmise that paste is some sort of buildup?I'll just clean TCO and tank top and reassemble.

Definitely worth a try

(4) But... HOW does heatfrom tank top cause this disc to move upwards into TCO causing loss ofcontinuity/power cut off?

I was expecting sort of bi-metallic sort of heat sensing setup...

The Disc is Bi-metallicAnswered 906 days ago | The Doc
Mira Sport too hot 1 Answer

Q: The water from this shower is always boiling and will not cool down by turning the temperature knob.

Submitted 920 days ago | by greedygazza, Lisburn
! Answer this question

A: You don’t mention which model of Sport you have, However......

The things to check first are.

1 That the main valve coming into your house is fully open.

2 Then check that the valve on the line to the shower is fully open.

If these valves are not fully open then there may not be enough water
getting to your shower to cool it properly the overheat safety device will turn
the power off until it cools Then it all starts again

Make sure that the shower head is clean and clear, that the hose isn’t kinked (this can happen just behind the hand set where it is difficult to see) also check the inside of the hose although it can look OK on the outside it could have collapsed internally
If all of these are OK then you are going to need a new pilot valve if you have the older model and a new flow valve if you have the newer Sport

Answered 920 days ago | The Doc
Mira Sport Max 1 Answer

Q: Hi,



I bought a TCO from you for the Mira Sport Max Shower and I fitted it fine and the shower is now working a treat !



The only problem is I dont think I have put the overheat light back on the terminals it came from as when I took the TCO out, the terminal screws fell out and the overheat light wires came loose.



I put the overheat light wires back as I thought but now the light is on all the time - but the shower works fine. I put one wire to the TCOs earth terminal and one to the left hand terminal (as you look at it) on the TCO.



Can you advise please ? Should the overheat light wires go to the left and right terminals on the TCO ?

Submitted 962 days ago | by Gilbertworld, Leicester
! Answer this question

A: Sorry we don’t have wiring diagrams for this shower you could try Mira directly  http://www.mirashowers.co.uk/home.htm or if you send us a few photos we may be able to work out what goes where.

Answered 962 days ago | The Doc
cold water 1 Answer

Q: My mira sport 9.

Submitted 1219 days ago | by rennie555o, DH5 8HQ
! Answer this question

A: Here is how to check the Thermal Switch/Thermal Cut Out

A faulty TCO will have no continuity across the two terminals (The black thing on top of the heating tank)

Therefore a good TCO will have power at both connections and a faulty TCO will have power at only one.

(The function of the TCO is, if the water over heats it cuts the power off to the elements)

See Video.

http://www.youtube.com/user/showerdoc#p/u/2/_zi8JbEMYMs

Answered 1219 days ago | The Doc
Mira 8.5kW sprint 1 Answer

Q: The shower runs cold, then the thermal switch operates and powers up the element. You can then hear a boiling noise and the thermal switch opens again making the water cold again.



I assume it's the thermal switch, but why does the element boil up like this? Does the thermal switch reset itself? as this is what seems to be happening, other makes are one shot devices that have to be replaced?



Don't want to change thermal, and then find its a dodgy heat exchanger?



May be not worth repairing.

Submitted 1285 days ago | by Pwee
! Answer this question
Sounds as though the thermal switch is operating correctly and the problem is not enough flow through heating can.
A: Check that hose is not kinked or collapsed internally and then shower head is clear.
Check that mains stopcock and any isolation valve in the feed to the shower are fully open.
Check that inlet filter is clear.
If all above are ok the it is either the pilot or flow valve at fault depending on which model of Sport you have.
If you click on the link below it will take you to our Mira page and you can identify your model and order the part required online.##

http://www.showerdoc.com/shower-spares/miraAnswered 1282 days ago | Anonymous
mira sport 7.5 volt shower 1 Answer

Q: could you please confirm that this thermal switch will work in my shower

Submitted 1424 days ago | by muckypat
! Answer this question
As long as it is post1998, if an earlier model then you need part no 872.30.
A:
AlastairAnswered 1422 days ago | Alastair
Customer Reviews
Mira electric shower no hot water
Not much I can say except a trouble free next day delivery and it was easy to fit. Works perfectly. (I had two as Mira showers already fitted a new switch under warranty) ukracer, KIdderminster
07 November 2013 Rating:     
Mira shower only giving cold water
Fast and efficient Zed, Leicester
07 June 2013 Rating:     
Mira electric shower no hot water
Great service ordered Fri arrived Sat

would use again yorkie, leeds
02 June 2013 Rating:     
Mira electric shower only cold water
our shower started running hot then freezing water after 10 seconds then just gave up all together and just stuck with freezing water. A ten minute swap of this part and my Mira shower was working as normal once again. john, nottingham
15 May 2013 Rating:     
Thermoswitch replacement
Quick service...24hrs from order to delivery...fitted in minutes. When the first one went...took 3 weeks for company to replace!!!!!! dazjvans, Wiltshire
30 April 2013 Rating:     
Mira thermal switch
Works we'll and came in good time Gary, Stamford
02 April 2013 Rating:     
Mira electric shower cold water
The part arrived quickly, was easy to fit and worked a treat.

A real money saver, Thanks Shower Doctor.

Dan Erdyderdy, Somerset
30 March 2013 Rating:     
Mira Thermal switch
Hi Guys,

Thanks for saving me from spending a fortune on a replacement shower. The Thermal cut out worked a treat. Thanks for the advice. I will use you again in the future. Chris_Gray, York
13 March 2013 Rating:     
Mira thermal switch

First class postal delivery service!!

Although a replacement shower part was required in Northampton and Shower Doctor are located in Edinburgh, the replacement (Thermal cut out) ordered from the Shower Doctor Website on Tuesday at midday was delivered on the Wednesday by post before midday.

The part was correct, reasonably priced as was the cost of delivery. A thoroughly professional transaction with a thoroughly professional company.

Thank you Shower Doctor. Anonymous, Northamptonshire
07 March 2013 Rating:     
Mira TCO
QUICK AND EASY SERVICE. FITTED AND BACK WORKING IN NO TIME. HIGHLY RECOMMENDED Anonymous, YORK
06 March 2013 Rating:     
Which screwdriver?
What kind of screwdriver do i need to change one of these? Is it called Torx? If so, what size? Many thanks.

Showerdoc Reply:

Its a Torx screwdriver (T10) which can be purchased from your local B&Q mick, leics, UK
26 October 2012 Rating:     
Mira TCO - Excellent service as always.
Reordered it from the details from last year. Rather disappointed that the part only lasted a year.

However your service was excellent again and it arrived the next day. Thank you


Showerdoc Reply:

Thank you for taking the time to review this item and your repeat order.

It would seem you may have an underlying issue which caused your Thermal cut out TCO to fail the first time round. 

This particular item is a safety device and should activate if the shower over heats. If you are experiencing the shower cycling hot / cold then this could be the problem. 

Normally this device will activate and reset after about 15 - 20 mins once the shower has cooled however it will eventually fail completely.  

See some possibilities to why this would happen below:

Lack of water pressure to the shower
Cold water mains stop tap not fully open
leak inside the shower
Melting wires on the elements or terminal block

If you find that all the above are checked and ok , then it sounds like you might have a faulty flow valve in the shower causing the shower to over heat. 

If the shower starts to overheat and this TCO activates again , please come back to us for advice to save this item failing again.

Regards

The Showerdoc 



Sunnylady, Hampshire
24 October 2012 Rating:     
Great Service
The web site was easy to negotiate and identify the product needed. The part was delivery very quickly. Would recommend Shower Doctor. We telephone with a query, which was dealt with very efficiently and reassured us that we were ordering the correct part. Happy Customer, Glasgow
09 September 2012 Rating:     
Solution for a cold shower.
Simple fix, cold shower. Took me 40 minutes to replace. It does not help when you do not remove the shower from the wall. A bit time consuming but before and after photo are very helpful.

hopefully will not need to do again, but you never know.... Mustafa, Birmingham
07 September 2012 Rating:     
Brilliant diagnoses and service
416.41 is so easy to install with the video on website. MMC, Cork
02 September 2012 Rating:     
Mira shower TCO
Can't speak highly enough this site saved me a fortune and I was going to have a full new shower fitted costing me £300 ,  but I followed the testing instructions on this site and replaced the very cheap part think I spent about £11 and my shower is working again. Anonymous, Unknown
28 August 2012 Rating:     
Mira TCO - fast delivery
Excellent service and next day delivery to North Scotland Sandy, Morayshire
25 August 2012 Rating:     
Mira thermal cut out - Great service!
Excellent online technical help from shower doctor with useful youtube links. Replacement part despatched in record time!! James, Fochabers, Scotland
23 August 2012 Rating:     
Mira thermal cut out
Great service part delivered next day 10/10 Anonymous, bristol
22 August 2012 Rating:     
Mira Thermal Switch (TCO)
I am really pleased with the product I received and the service I was given. I thought that I was looking at buying a new shower but instead for a few pounds I have got the old shower working just like a new unit.

Many thanks will certainly recommend your service to others. Mikesdad, Eastbourne
21 August 2012 Rating:     
Mira Shower part.
The part has now been fitted and is working perfectly.

The excellent service was much appreciated and the speed of delivery was outstanding.

Thank you very much.

Allan Wood Anonymous, Barnsley, South Yorkshire
21 August 2012 Rating:     
Thermal switch replacement
I am not a spark, quite fidley and I droped a scew so in the end had to take shower off to shake scew out. having done that the exchange is quite straightforward and the shower was like new. I did clean off the corosion on the top of heater to make good contact.

Tip: Magnetic tool would be a better solution.  wet, Nottingham
14 August 2012 Rating:     
THERMAL SWITCH SPARE PART
The part was easily identifiable on the website and the order was easy to place. The part was shipped quickly and received in good condition. It was easy to fit, but remember you will need a torx driver to carry out the works. neiljd22, Oxford
26 March 2012 Rating:     
Mira Showers Spare
After a minor problem with the item (wrong one ordered) a new one was sent and the money for the first refunded. All very quickly done. The new product is now installed and working perfectly.
Anonymous, New Quay Wales
24 March 2012 Rating:     
Thermal cut out - 416.41
Great firm . part arrived quickly. video to check item was brilliant for anyone who knows how to use a multi-meter. saved me from having someone in or buying a new shower at £200 plus. keith, peterborough
21 October 2011 Rating:     
Mira electric shower (now has hot water)
Good item, shower now working good as new. Anonymous, wolverhampton
24 September 2011 Rating:     
very happy
simple ordering system with help to ensure you order correct part. delivery arrived before expected. fitted tco in 5 minutes - hot showers again. very happy jagdev, leicester
14 September 2011 Rating:     
Thermal switch
Great product. Easy to fit. Watch out for hex head screws that hold the switch in though as they strip easily. Not a problem just grab other end of srew with pliers and turn. Anonymous, Unknown
13 September 2011 Rating:      
Thermal Switch
Thank you for the excellent and speedy service, got the new Thermal Switch fitted and shower working great now.

Leslie Robinson

Digitech

hargreaves55, Southport
13 September 2011 Rating:     
Great advice - right part - prolem solved
Had a faulty Mira Sprint - running cold or cutting out. Having read the information on Sshower Doctor forums, I checked the existing switch, which seemed faulty. Ordered and fitted this new part and the problem was solved. Many thanks. Prompt delivery, right part, right advice.

I could only ask one more thing - fitting the part was a little fiddly, perhaps some advice in the forums about the best way to get at it? This is a very minor thing though. I did the job fine, the part and experience from SD was faultless. Many thanks John, Leicester
11 September 2011 Rating:     
Great service!
Your website helped me to find the problem and your really fast sercvice meant my shower was up and running the next day! I cannot put into words how good I think you are, for sure I will recommend you to others and will use you again in the future! Thanks again! Murdo, Western Isles
11 September 2011 Rating:     
Thermal Switch 416.41
Yes it fixed broken mira shower.

First class service. Tim, Leicestershire
07 September 2011 Rating:     
MIRA THERMAL SWITCH-416.41
IT FIXED MY SHOWER! Gary27, Loughborough
04 September 2011 Rating:     
Mira thermal switch
Item quickly found on the website and once ordered excellent communication and very quick delivery. D B McIntyre Electrical, Perth
01 September 2011 Rating:     
Shower working like new now
I thought i was going to have to replace the shower at a cost of £170.00.

The help i got from the shower doctor site was excellent, I replaced the thermal switch myself and saved myself £159.00.

Shower working like new. Anonymous, Nottingham
31 August 2011 Rating:     
Mira Sport shower packed up!
My Mira Sport shower stopped heating. Surfing the net I found the Shower Doctor, their team diagnosed a thermal switch fault. I received one from them in the post, had it fitted and hey-presto that saved me a lot of money. Many Thanks. Ste, Southport
19 August 2011 Rating:     
Feedback
Shower now working again. Part quickly received. Thanks for the diagnostic advice on the website which helped to find the problem. Ken, York
16 August 2011 Rating:     
Mira Thermal Switch
Great website, fantastic, friendly and knowledgeable sales staff, prompt delivery (within 24 hours to Liverpool, standard delivery), extremely reliable overall

Very pleased. I would not bother going anywhere else if you have a shower related issue. Unni, Liverpool
11 August 2011 Rating:     
Great product
A great product, fast delivery,great company. napoli, Nottingham
09 August 2011 Rating:     
Mira Thermal Switch
ekirby, Merseyside
08 August 2011 Rating:     
Replacement Thermal Switch - 416.41
Such a small price to pay to avoid having to buy a new shower! Not difficult to fit and working well. Seagullfan, Midlands
20 July 2011 Rating:     
Brilliant.
On the button diagnoses and delivery. Tips for installation were as good as any customer could ask for. Thank you shower doctor. waterproof, Ireland
19 July 2011 Rating:     
the servce was excellent
the servce was excellent,no hassle easy to use website & very prompt delivery of part ,will most definately use again & recommend to anyone,many thanks...the pople family pigger, bristol
16 July 2011 Rating:     
What fantastic service!
What fantastic service! Ordered my shower part just before 3.00pm and it was delivered by post the next day. Would highly recommend The Shower Doctor. Our shower broke down and I was looking on the internet for a new shower and accidentally stumbled upon The Shower Doctor, after looking on the FQA saw the same fault (shower running cold). Ordered the new part and the shower is now running as good as new. Thank you so much to The Shower Doctor, you have saved us a fortune. Mikey Mike, Pontefract, Yorkshire.
08 July 2011 Rating:     
It was well priced
Thanks for the info and the product. It was well priced, packed and quickly sent. Thanks Carl, Grantham
07 July 2011 Rating:     
Review for an excellent service
Had trouble with my Father-in-Laws Mira shower.

Went onto ShowerDocs Forum where they were first rate in helping sort out the problem by diagnosing the trouble, recommending the part and suggesting where to buy the part.



I decided to buy the part (good price too!) for the part and installed it myself with their written help.



Excellent friendly Company with a 5 Star service.



I definately know where to go when I have trouble with my shower.



Thanks, Merton69, Bristol
29 June 2011 Rating:     
Very pleased
My dad was very pleased with the rapid delivery and price of products will be using again none, nn169ax
26 June 2011 Rating:     
Pat
Order arrived within 48 hours of ordering. Excellent service. This is the second time I've used Shower Doc and can thoroughly recommend them. Pat, West Midlands
15 June 2011 Rating:     
One simple Switch
One simple switch of a switch and a broken shower is now working again. Great Youtube video shows that fixing stuff is easy. Jez, Bristol
14 June 2011 Rating:     

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