Goodman GMP Series Furnace on-off


Old 01-09-10, 01:47 PM
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Goodman GMP Series Furnace on-off

Goodman Model GMP125-4 new 2000. This is the way it runs all day long. flame on 3 minutes, then flames out 2 minutes, flame on 3 minutes then off two minutes ETC. Overtemp limit switch OK,Filter OK,Coils are very clean ?
What else can be causing this thing to run this way
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Old 01-09-10, 03:06 PM
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What does the blinking LED in your furnace panel display when it cycles off ?
Old 01-09-10, 06:16 PM
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Duct could be inadequate. 125,000 btu furnace is a huge furnace. How much space are you heating.
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