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Have you tried cleaning the flame sensor?
Your money goes into an account and then when question is complete, you hit "accept" and technician gets paid.
Give me a minute to look up the GMH
The upper panel must come off, with 2 thumbscrews. Then locate the burners
Yes, you can either turn by hand or use a slotted screwdriver.
Shouldn't see coils. The burner compartment is what you want. Right above the blower compartment which will be at bottom of furnace on an upflow furnace.
There is a small window in blower compartment. Thought that's what you were referring to.