Goodman GmP100-5. Intermittent heat 4 flashes

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Old 12-19-16, 11:52 AM
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Goodman GmP100-5. Intermittent heat 4 flashes

Furnace will turn on and run w heat for 5-10 min then flame goes out fans continue to run for another 5 min then gas turns on again w flame to continue to heat u til desired temp
 
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Old 12-19-16, 12:11 PM
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Welcome to the forums.

The 4 flashes is telling you the furnace is overheating.
Possibly a clogged filter, blower motor failing, too many closed registers, blocked returns.
 
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Old 12-19-16, 04:02 PM
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Okay so the return ducts could b sealed better at return But I removed squirrel cage when I got home this afternoon so I could check aux switch in blower housing. I noticed what appears to be dried oil on one side of motor an splatter marks. On side not face where shaft comes out but on the side/ bottom. Where naturally gravity would have it be.
 
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Old 12-19-16, 04:08 PM
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Oh yea so put back together and same symptoms, inducer/ignite/ flame/blower. Runs perfect for about 7-10mins then flame goes out blower/exhaust fans run for 3-4min then I hear inducer sounds as if it cycles (off/on) and furnace flame up again repeating that until thermostat is satisfied. ( 4flashes) in between flame out & when it re ignites. GMP100-5. Prob 20++ years old
 
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Old 12-19-16, 04:13 PM
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It's not a sealing issue in the return side...... it is a blockage.
 
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Old 12-19-16, 05:14 PM
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PJ, thanks for your input. I've checked the return ducts doesn't seem to b blockage however I'll take a thorough look w/ mirror n maybe superstate at a section to make sure. I know 2 or 3 vents where left off for a few years so it is possible somthing got sucked up and is caught on a screw or burr.
 
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