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Heater doesn't work

I have the round digital honeywell thermostat. Usually I switch the little knob to "heat" and the other one to "fan" and press the up button to increase to desired heat, the hot air comes out. Yesterday, I did the same thing and it isn't working anymore. I just feel the cold air coming out of the vent. I've been messing around the set button but still nothing. Please help.

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How old, at a guess, would the thermostat be?

This will help in figuring out what might be wrong.

Posted on Dec 23, 2007


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