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Mend Potterton Home Heating Systems

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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
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