Question about Honeywell Programmable Thermostat Heater

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Honeywell round thermostat Model #T87F continuously running

We have turned the dial "off", but the baseboards are still red hot and the furnace still runs. Since this is a manual system is there any way to shut it down and perhaps fix it? It is approx. 18 years old.

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  • lmt1367 Feb 28, 2009

    Are the thermostat wires located on the furnace? How do you shut the zone valve?

  • lmt1367 Mar 01, 2009

    I just replaced the old thermostat with a brand new honeywell CT87N model, and the wires looked in good condition. I see the zone valve on the burner itself and can move it manually. There was a red wire that seemed to have come undone and I put that back in place on that zone. The baseboard is still hot, but I don't wan't to shut down the system as it is 19 degrees and snowing today! Thanks for your help!


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You either have 2 thermostat wires bare and touching or a zone valve stuck open

Posted on Feb 28, 2009

  • Hokie Mar 01, 2009

    There are thermostat wires on your thermostat and they are only 24 volt and on the zone valves, if you dont have zone valves the wire would be directly wired to your primary control(the reset button box) or into the aquastat to run the circulator. Often people move a thermostat to paint or paper a wall and the wires are bare where they come out of the wall or you have the old mercury type and it isnt level. A zone valve usually has a small lever or arm that can be maunually opened,if you had service recently check to see if your tech left a set of jumper wires on the burner or in a relay


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