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Furnace humidifier?
Matt
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03-19-2023, 05:10 AM
(This post was last modified: 03-19-2023, 06:47 AM by fredhargis.)
My guess is you have a coil going bad, they are in contactors to switch something on/off and they will buzz when they start to fail. My experience (and it's not a lot) os the buzzing gets really bad before they fail...they don't just stop working. But I'd still want it fixed, though if it's not making noise you may have to wait for it to get worse. Re read my first few words, this is a guess, maybe Roly or Blackhat has an idea.
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Get the doors off the furnace and run it through a couple cycles. You may have to hold in a fan door interlock switch to make it work or tape the switch down. There is a 24v transformer and it’s the likeliest culprit. Touch the transformer body. Warm is normal, hot is not. There may be a second transformer to drive a humidifier or an ignition transformer to drive spark ignition. Likely not a sign of immediate failure but pending failure is possible. Let me know what you find.
Blackhat
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