This question is regarding Mira Azora/Sprint/Sport/Zest Thermal Cut-out (TCO) - 416.41

No heat from Mira Sport Airboost 10.8KW

I was cleaning the shower and switched the unit on and off quickly. It made a chugging noise and now will not produce hot water. I do have lights on the unit. I will order a multimeter to test but wondered if this sounds like a TCO issue? Appreciate any help
Asked 6 years ago by Alun
I think you may have a faulty Thermal Cut Out (TCO).

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 until the water cools, this can take up to 15mins)

See Video:

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

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 6 years ago by Barrie Seabright

Thanks for the advice.

I have purchased a multi-meter, tested the TCO and it doesn't appear to have continuity.

The TCO is labelled
319853
T-O-D 60TF114
6174607110
A1434
L4BC L75C

is this the correct part to replace with?
www.showerdoc.com/mira-sport-thermal-switch-1746-436

Thanks,
Alun

Answered 6 years ago by Alun Emanuel

www.showerdoc.com/mira-sport-max-with-airboost-post-2011-shower-spares

These are the parts for your shower , and you may need part 1.

Answered 6 years ago by Barrie Seabright

I've ordered. Thanks.

Answered 6 years ago by Alun Emanuel

View Product and Order Online:

Do you need any additional help to find the correct spare part?

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