Quote:
Originally Posted by cabmando
You mention you used test mode. I believe this makes the system go through the stages of operation and then turns off. If you checked it only for a short period with the blower door off during self test mode, I'd put a jumper in, described in troubleshooting, and cycle the system. The jumper bypasses the thermostat and will allow the furnace to run for an extended period. I'd make sure you're in the high fire mode (I think you can jumper to high fire) and watch it with the door off to see if the code is set.
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It does appear to start up in high fire mode, and then run for about 7-8 min and then fault after that - at least that's what it did the other day.
I'm not sure this system has worked well from day one - I think it's just been faulting down to low heat mode due to the crappy return line. As I mentioned before, this problem showed up in 2008 and they "fixed" it (again, the talent thing) by using a different brand of filter (according to the notes on the lid here). That doesn't sound like a good fix to me...
-Wayne