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Mend Baxi HE18 Heating Radiators Pump

boiler keeps knocking off after 4hours?

had new baxi he18 heating only boiler installed. new pump and regulator valves on radiators. It keeps knocking off after a few hours then comes back on when the rads are cold. no matter if you turn heating up or down. Wiring been checked and ok.?????

keith
February 2010

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