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I have 3 zone valves in my house and even when they are turned off the heater keeps turning on whats going on ?

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It could be a couple of different reasons. It is possible that even though the thermostat is not calling the end switch on a zone valve may be stuck. Is there a zone that is warmer than it should be? Another thing, depending on the frequency of the cycling it could be a normal part of operation. (the boiler may maintain a low limit)

Hope this helps

Posted on Oct 05, 2009

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I will assume your heat is know as forced hot water heating. My house is multizoned however when the zone calling for heat turns off (zone valve closes) I installed a bypass valve in the lowest zone in the house, and reduced the circulator low shut off temp to 130 F which means even though the heat isn't on my circulator will continue to run dumping this excess heat in the lowest part of house to rise through house. (the spring loaded water valve allows the heated water to flow into this zone )We do have two thermistats. And even though the lowest one is not calling for heat the radiators are hot when the excess is dumped into this zone. So investigate and see if your system might be similar. (multizone).

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