Hello! Turned on furnace this year every thing was fine. Then I noticed that the temp in the house was 68 & the desired temp was set at 72. Then I set it up on 75 still did not turn on. About 2hr later the furnace turned on & shut off at 75. Every thing seemed fine. It turned on and off like was suppose to. Then it did it again. I thought it might be the thermostate so I bought a new one $78.00 Honeywell. Installed it but no difference. I can turn the blower on and it runs fine. I think it has a electronic pilot ignitor maybe this is bad? Can anybody help me! Thanks Thomas Mills

It sounds like your flame sensor is dirty and the module is locking out and after 2 hours it automatically retries that's a feature on that board.

it sounds like your flame sensor is dirty and the module is locking out and after 2 hours it automatically retries thats a feature on that board.
Ok I will try to clean it with some sandpaper?

it sounds like your flame sensor is dirty and the module is locking out and after 2 hours it automatically retries thats a feature on that board.
I think it might be also the ignitor. Do I reset or shut off power after I clean the flame sensor?

Yes the bower should run for about 90 seconds and then it should try to start

yes the bower should run for about 90 seconds and then it should try to start
I reset the power & nothing happened. If I turn on the blower manually it goes on. I saw something about waiting 2hours to total reset on the sticky. Maybe I should wait & see what happens? I think I might have 2 problems the flame sensor & the ignitor? I also saw on the sticky that there was a recall on the borad. My model is 58TUA080. Do you think that is it? Weather Maker 8000 2 speed Carrier. Thanks Thomas Mills

There is a pretty good chance I've had problems with those boards before