Goodman furnace inducer stops and starts at various intervals

Old 02-15-11, 09:58 AM
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Goodman furnace inducer stops and starts at various intervals

My Goodman furnace inducer stops and starts at various intervals. At times it runs fine but starts the same issue. Everything starts up accordingly, runs and then the inducer stops for a few seconds, flame stops blower continues to work then the inducer starts up, igniter starts, burners kick in and all works. Then the inducer will stop...I cleaned out the inducer to make sure that there was nothing obstructing it. I replaced the circuit board and it worked for about 2 weeks without any issues. Now it is doing the same thing. I have replaced the flame sensor rod and the air pressure switch. What am I missing?

Thank you,
Old 02-15-11, 12:10 PM
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You are missing an understanding of the sequence of operation of the furnace.

When the thermostat is calling for heat, the first thing that should happen is that the inducer motor should start and stay running until the thermostat is no longer calling for heat.

So you should use a multimeter to verify that the voltage to the "W" terminal is staying at 24 VAC, which it should be when the thermostat is calling for heat.

If that is the case, the inducer motor should stay on.

When the inducer motor shuts off, you need to verify that the 120 VAC to the inducer motor is being switched off. That would verify that the ignition control module is shutting the inducer motor off when it should be kept on. Replace the ignition control module.

In the unlikely event that the inducer motor is shutting off when the 120 VAC is applied, you have a bad inducer motor.

Odds are high you will find that the ignition control module is the problem.

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