My natural gas furnace is constantly blowing cold air. The furnace is made by Heil. The model number is NTC6075FBA1. The serial number is L984120332.
A few times over the past year, I've noticed the furnace blowing cold air constantly. I ''solved'' the problem by shutting off the furnace via the circuit breaker, and then turning it on again a few hours later. Unfortunately, this method doesn't work anymore.
The furnace constantly blows cold air, and the heat never comes on. The thermostat was an old-fashioned dial-type model. I replaced it with a modern electronic thermostat made by Honeywell. Didn't make any difference. Changing the temperature-setting on the thermostat has no effect.
When I take off the upper panel of the furnace while it's blowing, it looks to me like there is a pilot light burning. But I don't know anything about furnaces, so I don't know what else to look for.
The house is getting cold, and I can't really afford to get a repairman right now. Thanks in advance for considering this question.
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Alex C. in Rochester, NY
An indoor blower running when it is not supposed to usually indicates an overheat condition. I would guess that it has been cycling on and off for some time and finally caused the high limit to stick and not auto reset. if you tap it sometimes they reset. the real problem is that it has been overheating from lack of airflow, over sized unit, not enough return air, too many closed registers, dirty filter, dirty squirrel cage blower and or air conditioner a-coil. If you get it started again sit and watch the unit run the flames should come on and stay on for the entire heating cycle, not going on and off.
I wish I could help you more but it is difficult without seeing the problem myself. Good luck! this should get you started!
Check the induced draft motor see if it is running. There should be a vacuum switch with a 3/16 hose connecting it to the draft inducer motor. Take the hose off the drat ind. motor and check to see if the hole is open. take a paper clip and run in the hole, connect the hose and see if it lights.
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