Very interesting. On some of these they use a flame sensor that relies
on just a steel rod, whereby somehow the flame itself generates a
small voltage. Seems that would rely on sensing a voltage between that
rod and ground, ie EGC. And if the generator is not properly grounded to
the house ground, to the furnace, I can see how that would be a problem.
And don't ask me about the physics whereby that flame sensor works....




Trader, some electronic controls NEED the neutral power line (white wire) to be at or near the same voltage as the safety ground (green wire) or else they will throw an error code.

If the neutral and ground are bonded together in the generator as they should be, it should work fine.

Mark