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Question for Cotherm TSE00187 (Added 22/08/16 )

I have a two year old CESTB 340 immersion heater with COTHERM TSE00187 thermostat. The immersion has stopped working. I tried pressing the reset button on the top of the thermostat housing, but this has made no difference. (By the way, I got no sense of ‘click’ when I pressed the button – is that normal?).

How do I determine what the fault is or whether to replace the immersion heater or thermostat or both?

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