potterton 50e wot? suprima? profile? if u got a conventional system eg hot water cylinder then chances are its either air above the valve, faulty valve, faulty cylinder stat or possibly programmer u wil need a multimeter 2 prove which 1 is faulty, if u got a combi then u would be looking at flow rate and flow sensor, thernister, diverter valve and microswitch, plate heat exchanger or possibly pcb
blaiross
February 2012
Does boiler switch on? if not flow sensor fault, If yes thermostat fault
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