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Hi Dave, Thanks so much. I rechecked the microswitches & thermistors. The DHW thermistor was reading much too high, and on closer inspection it was leaking slightly which had caused corrosion. If I put an 11kohm resistor across then the hot water fires up fine. And the new thermistor will...

Hi All, I'd be v grateful for your advice. My Alpha 240E has stopped giving hot water. Its been flakey for a while but seemed to work if the heating was on for 5 mins beforehand. Now it hardly ever fires up and when it does it turns off again after a few secs. Looking at...