Goodman GMP100-3 Furnace Won't Start - HVAC - DIY Chatroom Home Improvement Forum


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Old 11-29-2012, 11:21 PM   #1
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Goodman GMP100-3 Furnace Won't Start


It won't do anything, not even a click. Board LED is constant red. Verified 120V into transformer, 24V out. It's only sending 16V to the thermostat (Red), and that 16V is coming back (white). Disconnected and shorted R->W, no change. Verified continuity on all switches. Reading 0V at inducer blower. I'm thinking bad board, since as far as I know, it should be 24V to and from the thermostat. Any other ideas out there?

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Old 11-30-2012, 05:38 AM   #2
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Goodman GMP100-3 Furnace Won't Start


Check that heat exchanger for cracks or popped crimp rings before investing money to replace the board. GMPs are know for popping crimp rings.

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Old 11-30-2012, 05:47 AM   #3
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Goodman GMP100-3 Furnace Won't Start


What is voltage between r and c, w and c.
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