I’ll follow up with where we ended up, as our issue progressed to furnace starting and stopping, over and over, before either settling out and running or going into a hard stop, sorry for your luck.
Turned out to be a loose connector on the power wire to the ignitor, which I’ll blame for start/stop.
The bigger issue that persisted after that was identified and fixed was two fold.
First, loose blade connector junction (don’t know the right name, two wires join on male blades with a third female blade connector) for the blue/white stripe thermostat wire to power wire to circuit board. So, thermostat was not always telling things on the board that it was time to kick on and run. Or, it would try but power didn’t want to play.
Second, the master connector to the board itself had loosened over time. When the furnace fan ran and vibrated, this would intermittently lose connection and the furnace would hard stop, no restart.
I’d go poke around and occasionally that would result in connections being restored and the furnace running properly. Sometimes it would not.
Finally called Redline Mobile RV Repair in west/central KY, and a couple hours later they had found and fixed the loose connections. We’ve been golden ever since.
Moral of my story, the electrical connections in the furnace do not like vibration, they’re not the quality hardware I would have hoped for.
