Goodman GMP100-3

Old 10-23-14, 12:52 PM
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Goodman GMP100-3

Hey, I have a goodman gmp-100. I got the 4 blinking light indicator a few days back. Open Limit switch. When i turn the heat on, the burners go for about 2 minutes but the an does not kick on. It finally kicks off and then blinks.

I tried turning on the FAN ONLY and it came on no problem and was pushing air thru the vents. So the blower works.

I checked the 3 limit switches and the buttons on them are flimsy, not stiff.

Any ideas. I have a multimeter, but am unsure how to check the limits
Old 10-23-14, 03:04 PM
Join Date: Feb 2014
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With the stat in fan "on" position does the flame stay lit and operate normally? With out the blower running it's going to trip off. I think your limit switch is doing it's job.

I would set the stat to auto and have the stat call for heat. Then go to the furnace control module. Check to see if you have voltage on G to ground.

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