Questions on Generac 6852 setup with Lightning

[CyclopsThere]

Wait - you can't just leave us hanging like that. What was the issue?

Oops sorry! I believe the electricians ended up running a separate ground to the generac, and the issue was exactly what EVpower posted above.

There might be an issue with the furnace flame sensor. Some gas furnaces run a very small current through the burner or pilot flame to the gas pipe to confirm the flame. There needs to be a path from the gas pipe to the power source neutral/ground bond to complete the flame prove out circuit.
This has been a problem with portable generator connections where the generator ground/neutral is not connected to home grounding system.

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