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Upstairs zone heat won't turn off

I have two zones in my house, upstairs & downstairs. Baseboard heat/ boiler/ propane. I noticed that regardless of the thermostat reading (nonprogrammable circle honeywell heat only) i can feel significant heat coming off the baseboard heaters. I have the thermostat set as low as 50, but still it gets up to 70 degrees up there. I can hear an audible "click" if I dial the thermostat above the current temperature, but I'm wondering if the thermostat is the issue.

I've inspected the zone valve on the boiler to see if it was manually set to "open", but its still set to auto for both zones.


  • psb75
    psb75 Member Posts: 830
    You might be getting 'ghost flow' to your upstairs zone. Thermosiphoning? We'd need more information about your system--pictures or a schematic drawing or both. Are there any flow-checks? What is the circulator? How is it performing? Etc. More information = "mo-bettah."