Hi Everyone,
I recently replaced my thermostat and upgraded from a mercury based thermostat to an electric programmable model and am having some issues with my furnace. Let me know what you think:
When I turn the furnace blower on "auto" and the heat to on and set a temp above the room temperature, the heat turns on, the fan turns on, and the house is brought up to temp. The furnace kicks off and the fan keeps running. When I turn the thermostat to "off" from "heat", the fan still runs. The only way to get the fan off (ironically) is to turn the fan setting to "on" from "Auto" and the system shuts down.
When I installed the new thermostat, I don't think I diagrammed the old wires (stupid, I know) but could incorrect wiring be causing this problem? If not, do you think this is a fan/limit control issue? This is an older furnace (an Imperial II from GE, at least 15 years old MODEL NUMBER
21LU130K28) and the thermostat is a honeywell RTH111/221.Any advice here would be appreciated.
Sincerely,
------------------------------------- James Kirkby