Goodman GMP100-3 Gas Furnace won't stay lit
Exhaust blower fan comes on. HSI glows. Gas burners light, but then go out after about 10 seconds.
Have checked 'pressure sensor' by disconnecting connections from sensor & connecting them directly to each other. Same issues as above.
Have cleaned the 'flame sensor' rod & adjacent burner housing.
Also cleaned connections at sensor & circuit board, as well as checking connectors 'clamping'/friction.
With voltmeter set to ACVolts 200, the reading between main 'Neutral' connection on circuit board & 'Ground' (screw on furnace housing) is 1.2.
Reading between 'flame sensor' & 'ground' is 0.2.
I appreciate any assistance.
GMPs are known for either cracking the heat exchanger, or popping their crimp rings. Check yours,may be time for a new furnace.
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