Only warm water on highest setting

I have a Mira Sport 10.8kW shower which I'm having problems with. It no longer produces hot water - only warm water when set at the highest temp. We thought that one of the heating elements may have gone BUT every so often, when turned on it will be boiling hot for a few minutes, then returned to warm (this doesn't occur every shower) There are no lights on that shouldn't be and it has had a new flow valve fitted fairly recently and a new thermal switch. Surely the element/s can't be gone if it does have periods of working? Any ideas? Thanks
Asked 9 years ago by Anonymous
If this is an intermittent fault then it maybe the PCB that is causing this. There is no way to test this apart from replacing it.

Answered 9 years ago by Anonymous

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