This question is regarding Mira Sport Thermal Switch - 1746.436

Mira Sport Max with Airboost 9.0 & 10.8 (J03G/H)

shower is less than 2 years old. Thermal Switch failed in January and replaced under warranty. It has now failed again 6 weeks later. Water pressure to house is high. no one in shower more than 10 mins only two people went in with 1 hr of each other night before Any ideas why or just bad luck? Would replacing with genuine part ourselves void warranty ?
Asked 3 years ago by Karen Will, scotland
You may have a problem with the relay board. see below . But you need to check that the inlet filter , head and hose are clear as well.

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 3 years ago by Barrie Seabright

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