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Have a Powermax 155x, approx 8 years old, tripping over heat and high limit stats once every three weeks or so, system is open vent with header tank, header and system full of water, gas rate ok at 18.5 kw, burner pressure fine at 4.5 mb, checked over heat pocket on top of boiler, reaches 84...

A up lads, have Protherm 80 e with no hw. When i open hot tap boiler fires but sends some heat down heating flow and some heat round hw heat exchange, the flow from main heat exchange gets way to hot and then boiler goes off on overheat, have tried diaphram on diverter to no avail. I am thinking...

boiler making humming noise any ideas

combi kettling badly on heating ,bit on hot water,no system bypass installed ,seems like struggling to circulate on heating more so than hot water then trips out on manual reset overheat stat,i think pump,anyone agree,flow and return temperatures are way out on diff

if boiler comes on when you think timer is not calling for heating or hot water then something is giving boiler a live feed,could be your 2 port valve as sometimes they are wired using five wires being permanent live,neutral,earth,hw on and hw off,could be picking its live up from the...