01:45PM | 04/03/03
Member Since: 11/01/02
6 lifetime posts

Any help you can provide would be appreciated. I have a 2 zone heating system using hot water baseboards. The upstairs zone will not turn off.

Both zones are controlled with Honeywell thermostats. The downstairs zone is fine, all the batteries are fine and no changes have been made recently.

However, for some reason the upstairs zone will not turn off. It reached 85 degrees upstairs, and I know my energy bills are going through the roof.

I tried removing the thermostat from the housing. That did not work. I tried disconnecting the thermostat from the electrical supply and that also seemed not to work. In desperation I have turned off the water supply to the baseboards at the furnace as a temporary solution.

If anyone can provide any hints on what might be wrong, I would really appreciate it. Thanks for any help you can provide.


12:45AM | 04/04/03
Find your hot water valve for the upstairs zone. It may be bad and stuck open. Start there. Test it to see if it is recieving a call from the stat.


02:25PM | 04/08/03
Member Since: 11/01/02
6 lifetime posts
Thanks everyone. It was indeed a stuck zone valve. It was a Taco type, and with the help of the friendly folks over at, I was able to replace it. The system is back to normal.
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