Old 07-24-08, 05:13 AM
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Join Date: Apr 2003
Location: USA
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I have a honeywell programable thermostat.This thermostat controls heating and ac and is ten years old.Yesterday we had as electrical storm and lost power five times during the day.
After the storm was over my air conditioning wouldn't shut
off nor would the display show temperature setting. The
display was blank.Also when I moved the thermostat switch
to off my heater came on. My feeling is the thermostat is shot
I would like to know if I should be looking at anything else in the system before bying a new thermostat? I would appreciate any and all sugestions.Thank you in advance.
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Old 07-25-08, 08:07 AM
Join Date: Mar 2006
Location: Wet side of Washington state.
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There is as much possibility that the logic board in your furnace has died as it being the thermostat.
Old 08-23-08, 07:18 PM
Join Date: Aug 2008
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i would say it is the thermostat because in my honest opinion the circuit board in the t-stat(thermostat) would be more sensitive than the furnace and if you look at it this way. your t stat gets power from the furnace. and has separate wires for the components ex. green is typically the fan in your a/c, red is your t-stat power, yellow is your cooling and white is your heat. so when you flip the switch to shut off the t-stat the red should be completely disconnected from any of the wires above (yellow,white,green.) so if it is not something in your t-stat could have gone. hope i helped
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