Quote:
Originally Posted by cabmando
From the sequence of operation in the owners manual:
The blower starts at approximately 400-500 RPM. After
20 sec, the motor is turned off for 1/10 of a sec where a coast down
calibration is done to evaluate resistance of the conditioned air
duct system. The microprocessor then determines blower RPM
required to provide proper airflow for heating mode.
Again, I'd make sure that every supply register is open. Yeah your return duct being choked down is half assed and shouldn't exist. No I don't think the dust in the flex is causing the issue. The flex itself can be an issue if the bends aren't smooth (like pictured) or where unsupported and sagging. The furnace should be adjusting for the inefficiencies in the duct system through the coast down calibration.
One more thing: What is the code number you're getting? 44?
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The code is indeed 44 right now. Nothing else either. I bought some stuff at the hardware store to clean out the vents. The trouble is, I found some stuff down there that looks like it might have asbestos in it, so I FedEx'ed it to the testing lab in Los Angeles and I'll have them check it (by Thursday morning). Then if that comes back all clear, I will crack open the return pipe and tape a filter to it and suck air from the basement area and see if that makes a difference. I'll also clean all of the dust out too while I'm there.
-Wayne