Help Troubleshooting Carrier Furnace
I have a Carrier 58PAV07-08, series 180, s/n 2801A50213
It started intermittently making noises. The noises generally start before the burner kicks in, and last until the end of the shutdown sequence. From my reading here, that would seem to indicate the induction motor.
The inducer assembly makes a raspy noise, pretty well all the time while running. It makes this noise when I turn the motor by hand too (using the plastic cooling fan). It spins very easily, though, and if I give it a good whirl, it coasts for an impressive amount of time.
Occasionally, it makes some squeeling noises, and a high-pitched whine. I've not been next to the furnace when it makes these noises, so I can't say where the sound is coming from but they again seem to correlate with when the inducer runs. The squeeling and high-pictched noises seem to occur when the house (and furnace I would assume) is cold (say, in the morning when it reheats from the overnight temperature).
My guess is that I should get the entire inducer fan assembly replaced. What can I do to prove that absolutely? Can the inducer fan simply need cleaning, for example? What else can I check?