[mcannell]

I have a Trane XE 80 installed in 1997. I keep getting a 4 blink error code. The burners ignite, the unit is hot, but the blower won't come on. I shut down the unit for 2 hours and then turn the heat on again and it works. But eventually it overheats again and doesn't work until I turn the call for heat off for a short period. I have all the vents opened, and I changed the filter.

Once I shut it down to cool and turn it on again this is the sequence.

The indicator light blinks solid and steady.
Exhaust fan comes on and blows.
Twenty seconds later or so the burners fire up.
About 2 minutes later the burners stop.
The indicator light blinks in 4 blink bursts.

I don't seem to have a high limit unit with a reset button. All I can find is a yellow wire that leads to above the burners that connects to what looks like a electrical capacitor that is held by a unit made of white resin, maybe? Then the capacitor leads back out to another yellow wire. There are 2 of these to the side and above the burners. I thought that these might be the switches that cut the power automatically if they heat up too high.

I'm about to tear it all apart to try to clean the blower but it really doesn't look that bad from what I can see, which is not much.

Please help, my wife & kids are freezing. We have 3-4 feet of snow on the ground and the house is in the 50's.

P.S. while messing with this I heard my air conditioner outside, unit with a fan in it, turn on and make loud noises because it is covered in snow. Does the outside unit come on when there is a call for heat?

[mcannell]

I'm beginning to understand what is going on...

The blower should start as soon as I call for heat but it doesn't. THAT IS WHY IT IS OVERHEATING! I was thinking it came on after awhile and wasn't because it was overheating.

I sat next to the unit while someone else turned it on.

There is a loud hum coming from the blower but the blades don't spin. That sounds like it is jammed or the motor is bad. I took off the air return and spun the blades and they move very easily. So it sounds like I have a bad blower motor?