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Thanks Tony havent tried that yet only bleeding the pump each time it happens, guess its a trip up into the loft ASAP Cheers

Hi I am new on here and wondered if any one can help. My central heating works fine for a while and then after a while once the stat has switched off and then when heating comes on again all rads do not heat up. I can cure this by bleeding the circulation pump and then all rads heat up again...