Carrier Weathermaker 8000 won't turn on sometimes.
It will work fine for a day, a week,. Anyway it will drop to mid 60s on Tstat (cold for us, set on 75) and won't start. My Tstat is located in the hall with no vents nearby. Ill flip the switch to ac and ac will work fine. Fan comes on and all. Flip it back to heat and hear the click for the call for heat but the system will not start unless I turn the switch off and back on. It can work for 1 cycle, 10 cycles, but eventually it will act up again. 2 friends with HVAC experience (not experts) checked it out and said flame was a good color, flue was nice and clear. Only code I am seeing right now it 12. Anyone have any clues. I really can't afford a full on service call with Christmas coming up.