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Overheat light on, no hot water

This question is regarding Mira Sport Max Shower Spares

On my Mira sport max I had a couple of days of what I can only describe as a banging sound followed by the illumination of the overheat light. I now have cold water flow but no heating. The overheat light has now gone off until you turn the shower on and then it illuminates.

Any suggestions?


Asked 7 years ago by Anonymous
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 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.

Since the Max has a PCB if the above is ok then it may be this that is faulty, as it shows the same symptoms sometimes.
Answered 7 years ago by Barrie Seabright
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