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central heating fault boiler will fire up for approx 5 seconds stop then do the same over and over again the rad do heat up and the neon light on the front of the boiler does switch on and off the the boiler . hot water is working fine. please help the sound of the unit fireing up is starting to...

Hot Water/central heating fault. central heating constantly on even when switched to hot water only. also the analogue timer is not working. Boiler will stay on in all 3 positions. the boiler was working fine till last week it over heated twice and I manual reset it .then this fault accrued...