Rear furnace blowing cold

[RKC02]

Marglowe3: mine was the rear furnace- turned out to be defective circuit board on the furnace itself. No way to diagnose other than eliminating all others.

[marglowe3]

Thanks. We have tried all the other suggestions and no change. How did you learn it was a defective circuit board?

[RKC02]

Service tech removed it, went to shop for test and found the board bad. One day order for part and back in and working.

[marglowe3]

Thanks! Will have it checked.