Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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Home heating and thermostat

Home heating system
honeywell t8635l thermostat- have three zones in house.

Two zones are working but the main zone will not come on to heat.
It has all the appropriate lights and numbers on the thermostat when I enter information but no response from heater.

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It is possible the relay on the zone board is bad, You can test the thermostat if you own a voltage meter. It is possible for the thermostat to display and still be bad.

Posted on Mar 20, 2008

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