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It does still cut out with the head off but it takes longer to get to that point. Thanks for the clarification on testing the TCO.

Thanks for the replies. I get a "Reduce temperature" light but the "Low pressure" light does not come on. I wasn't sure about getting a meter on to the thermal switch because I assumed it wouldn't be safe to run the shower with the cover off. I guess I can give that a go carefully.

Hi, I wonder if anyone can offer me some advice. I have a Bristan B85 shower which trips out thermally every couple of minutes. Water flow seems good, not slow or intermittent, and the water temperature is not getting unusually hot before it trips. Once it has tripped it runs cold for a few...