Mira St thermal switch

I have a Mira Elite ST 10.8 W and the thermal switch has gone faulty 8 times since it was installed in February 2010. On average breaks down after about two months. What could be the cause for such frequent breakdown. Mira even replaced the whole shower unit once. It is under guarantee so Mira engineers fix it but don't have an explanation why the thermal switch goes faulty so quickly. Any suggestions!!

Thank you. Ranj
Asked 12 years ago by Anonymous
This is a real conundrum , about the only thing I can think of is to check the voltage into the shower and make sure it is no greater than 240volts

Answered 12 years ago by Anonymous

One other thought.

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 12 years ago by The Shower Doctor

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