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how to fix my potterton boiler envoy 50,000 btu?

boiler will not turn off with the programer is the fault in the controler in the boiler ?
t a hilton, July 2007
no, it will probably be one of your zone valves. either its stuck open or the microswitch inside is faulty

Paul the gas man, July 2007
link Click here to see other fixes for Potterton.