The furnace cycles on and off every 3 to 5 minutes for several hours, then doesn't seem to come on for 30 or so minutes, Then it begins cylcling on and off again every 3-5 miutes. I have checked the led and the code is one short blink with two long ones. I assume this is 12. However what I have read about code 12, it doesn't seem to tell me anythig except the blower begins first. I would appreciate any advice I could get on fixing my problem
Thank You very much.