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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.
Thanks.
 

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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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