[LWJ]

So my house lost power for a few days. It was cold. I borrowed (with conversation on buying) a generator and wired in my furnace's. The fan blowed but the igniter didn’t fire. Polarity was correct as I checked it. The cord has a ground.

Power came back. My furnace works.

I am happy to buy this generator but I think the output is too dirty to run my furnace.

Thoughts?

Furnace is an old Trane and is on last legs.

Generator is a Generac brand inverter style.

TIA!!!