Gas Furnace Acting Up

Old 01-01-13, 05:44 PM
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Question Gas Furnace Acting Up


I have a gas, forced air furnace system in my home that has started acting up over the last few (coldest) days.

I might have the themostat set to 74 degrees. It may get down to 68 or 69 degrees and doesn't kick on. Sometimes it will, sometimes it won't. It's just been sporadic. I can hear furnace ignite downstairs, and the fan down there blows, but the blower doesn't kick on for the house.

Here's the thing. I played with the thermostat settings when it stopped working and had a few weird results.

Thermostat set to Heat setting, and fan setting set to AUTO....the air doesn't blow in the house. All I hear is the furnace ignite downstairs.

Thermostat set to Heat setting, and fan setting set to ALWAYS ON...same thing as above.

Thermostat set to OFF, and fan setting set to ALWAYS ON....the fan starts blowing...albeit cold air.

Any ideas on this? Does it sound like a bad thermostat, or something do do with the furnace? The thermostat is a decent digital one, and haven't had any problems until now.


Old 01-01-13, 05:58 PM
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Thermostat is fine. You need to observe what happens when the furnace tries to start and post back that information.

For example, inducer fan starts, ignition lights up, main burners light and stay on, main blower starts.
Old 01-01-13, 06:47 PM
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What is the make and model number of your furnace?

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