Need help with a SF 30 Suburban Furnace
My original problem was the usual story. The fan would come on and the furnace would fail to light and the fan would then shut down. I, standing outside could hear the switch and smell gas but the spa...
Forum Discussion
mikestock wrote:emblethen wrote:
I think the OP is in over his head!
So clairvoyant. You remind me of my wife.
I received the new Coleman thermostat today and installed the it. The circuit board was identical to the one I replaced and everything works perfectly. I still don't know the exact problem with the old thermostat but the new replacement solved it.
I had already eliminated the most common causes, the sail switch, the over temperature switch or dirt dabbers. The furnace would work when I applied 12v. using an external battery source, so it left only the thermostat or some unlikely cause, like rats.
I think you stated you may have caused a backfeed short when you were diagnosing the Furnace system. That may have blown something on the tstat circuit board. Have you looked at the Tstat circuit board for any burn spots? Doug
