This question is regarding Mira Sport Thermostatic - Shower Spares

Mira Sport Shower

Hi there I have a Mira Sport electric shower installed that must be about 18 years old. It has served us well, but last night when switched on it is just running cold water. Adjusted the temperature, and there is also no low flow light coming on. I checked the consumer panel and nothing has tripped. I'm assuming, after reading various stuff on Internet that the thermal cutout switch could be gone. As we may be moving house in a few months im loathe to spend a lot of money on this. Can you advise whether I could replace the thermal cutout ( I'm not an electrician ,) or what my next steps should be? Thanks for your time!
Asked 7 years ago by Gerry
If the shower is absolutely cold then I think you 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 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.

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

If there is some heat it may be a faulty 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 around 12>18 ohms.

If you have power to the elements and no heat it's probably the elements, no power to the elements 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 and testing the various parts of your shower.


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

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


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

Answered 7 years ago by Barrie Seabright

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