This started a few days ago. I had noticed that the exhaust fan would turn on, followed by the burners kicking in... and then I had noticed that a few minutes had gone by the the blower wasn't running.
I would go to the thermostat and it would read "Heat On", yet wasn't blowing any air. I would switch the thermostat to "off" and back to "heat" and then everything cycled in order and all was good.
I noticed it did it again last night. I went over to the thermostat and performed the same steps and voila... everything was working again.
At this point, I figured that this wasn't just a fluke that I should call someone in the morning.
Sure enough, I wake up this morning to a similiar issue. This time, nothing had fired up, the thermostat was at 66 degrees with it set to 70 and it read "Heat On". No exhaust fan, no burners, no blower. I performed the same steps and it was fine.
Now its at the point that manually flipping it to "off" and back to "heat" is the only want to get the furnace to work.
I have a repair guy on the way (should be here any minute), but I was hoping to get some people's ideas what might be wrong before he slaps me with a $500 bill.
The furnace and house are both 18 months old. This is a bit of a shock to me because this is the first time in my 10 years of owning a home that I've had furnace problems.
Not sure if this matters, but the furnace is a York.
Any thoughts? I'm thinking a relay switch on the board... but I'm confused as to why it won't cycle by itself, but will cycle when manually switched.