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:cry: For a couple of months had intermittent hot/cold water. Boiler keeps turning itself off. Plumber hasn't been able to fix despite cleaning heat exchanger, checked pump, removed and cleaned diverter valve, new thermostat - but no joy. Heating seems to work ok. Plumber won't return...

Hi SIME Friendly Format 80E Combi-boiler - 5 years' old For month now, boiler keeps cutting out (every few seconds). Hot water taps running lukewarm/cold/lukewarm/cold. Plumber says thermister needs changing. He operated boiler without thermister to test it, and, although kitchen tap...