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Old 03-15-2013, 06:46 PM   #1
HWB
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Goodman GMP100-3


My furnace does got come on it just makes a humming noise?

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Old 03-15-2013, 06:58 PM   #2
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Goodman GMP100-3


You should have a blinking diagnostic led light on the board and a legend on the inside of the furnace doors that will translate it all into something useful.
Check out if there is a viewing port on the furnace doors to look for that led light without having to open up the furnace.

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Old 03-16-2013, 03:27 AM   #3
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Goodman GMP100-3


You should also check your heat exchanger. It may have popped crimp rings.
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