How can my furnace exhaust fan run with the power off, the thermostat off, and the breaker off?!
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If it's running under power, check your breakers again. If it's turning slowly, wind might be blowing in your exhaust vents. Check those two things.– ValkorMay 16, 2019 at 13:57
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2It can't. You're mistaken. Is there a local power switch near the furnace?– isherwoodMay 16, 2019 at 14:49
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1Shut off (nicely) anything (like a desktop computer) that would mind and turn the MAIN breaker off. Still running, or no?– EcnerwalMay 16, 2019 at 15:11
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What kind of furnace is this? (Make/model would be helpful)– ThreePhaseEelMay 17, 2019 at 1:15
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1 Answer
Some furnaces have more than one breaker
Well, most honestly.
- The Air Conditioning unit has a breaker
- If present, electric heating elements (e.g. emergency heat) have one or more breakers
- The blower will have its own breaker, typically shared with the electronics on a gas furnace
- A built-in humidifier or dehumidifer may have its own breaker
- Depending on location, the 24V thermostat transformer may be on yet another breaker
Unrelated, the radon venting system has its own breaker.