Goodman Furnace Won't Fire, Inducer Motor Issue?

Old 11-24-21, 04:23 PM
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Question Goodman Furnace Won't Fire, Inducer Motor Issue?

Good evening,

I've been troubleshooting my Goodman furnace for a few days and it will not fire. Here's what I know:

1. I am receiving the three-flash code--meaning the pressure switch is not closing
2. I have cleared out the flue and even tested without the flue attached
3. The pressure switch is functional (if I create suction using mouth the switch does close and the furnace ignites)
4. The tubing is in good condition and clear of obstructions
5. The inducer motor fan is running correctly
6. I feel absolutely no vacuum from the inducer motor on the tubing connected to the collection chamber (first time working on this, so not sure if it would be a perceptible suction)

I'm fairly sure it has something to do with the inducer. I've cleaned the connection point with a needle and there is air blowing out into the flue, but the pressure switch is still not being triggered. I do not have the device to test suction. I even purchased a new pressure sensor that requires less suction and it still doesn't trigger. Does anyone have any idea what the issue may be? I've exhausted my current knowledge.

Thank you in advance!

By the way, I moved into this home this year so I have not run the furnace before
Old 11-24-21, 06:32 PM
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Welcome to the forums.

Without a manometer you're just guessing. If the inducer is running..... there has to be vacuum created but without a gauge you'll have no idea how much. Replacing the inducer can cause problems when a proper gasket or sealer is not used. You don't know if the inducer was messed with. Holes in the heat exchanger and partially plugged flue lines are also problem causing.

You said you cleaned the hose nipple. It MUST be cleaned thru to the fan blades. Use a piece of wire and verify that it goes thru the fitting and into the fan area.

You could get an inexpensive liquid type u-tube manometer from amazon or ebay.


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