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Sometimes when the Master Bedroom (MBR) zone thermostat is not calling for heat, the zone gets heat anyway. It does not get as hot as it would if the thermostat were calling, but it is warmer than I would like. I think the MBR zone is passively drawing heat when other zones are running. Is that possible? What is the cause and remedy?
For example, if all zones are not calling and then I turn up the basement zone, the basement pipes will get hot (increase > 30+F) and the MBR pipes will slowly creep up maybe 5-6F. As best I can tell by listening with a screwdriver in this case, the MBR pump is not running and the basement pump is.
I believe the thermostat is wired correctly because it will turn on the zone when the setting calls for it. There has been no change to the thermostat wiring in 6 years.
I don’t know when this problem started but I have lived here for 7 years and there have been lots of years when the MBR zone worked correctly. Last year was the first year of service for a new boiler.
My home was built in 1986 and has 6 zones of forced hot water baseboard heating running off a gas-fired Laars Minitherm boiler.