I have a new, 3-year old, high-efficiency furnace in my home. Last year it started making a slight whining noise that was audible during the very first stage, before the blower motor started. No problems. Some weeks ago I started to hear a rumbling noise when the furnace kicks on–again, first stage, it's not the blower. The rumbling sounds a bit like the noise my fridge fan makes when its a little off balance. What might be causing this?
What’s causing the rumbling sound when the furnace kicks on
furnacehvacnoise
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Best Answer
I'd have a look at your draft inducer motor. Do a Google image search for "Furnace draft inducer" to see what it looks like. I has the same kind of impeller as your main blower but on a smaller scale. You may have some debris in there.