Quote:
Originally Posted by Wayne 962
cabmando - I'll get you that info soon, heater is apart and it's getting cold so I need to work semi-quickly.
So, I disconnected the return line - what a convoluted POS setup this is. BUT - disconnecting the line did not make a difference! I ran the heater with the return line disconnected, *and* with the filter removed (just for 20 seconds during the test mode), and it still came back with the 44 code. By the way, it shut down last night for it's "3 hour reset cycle" on its own.
So, with the return disconnected and the filter out - it still gives me the 44 error! Running the motor with the cover open (so it gets air from the room instead of from the return circuit) resulted in no errors. So, is there an obstruction in the return duct all of a sudden? Is the line just so long it can't get air? I thought for sure removing it from the screwed up intake vent (semi-crushed by the beam ) would help, but it did not! Right now, I'm headed back down there, and I think I'm going to chop about 20' off of the return line and see what happens. I have to be careful not to screw up the entire setup. We do have another FAU in the house, and we do have a wood burning stove, but I wouldn't hear the end of it if the unit was down and inoperable for several days...
-Wayne
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Seems to me if it'll run with the blower door open bypassing the return duct, your issue is the return duct and most likely since it faulted with the flex unhooked from the drop duct coming out of the crawl space, your issue is the drop duct itself. Need to know the size of that duct.
Quote:
Originally Posted by Wayne 962
If it runs fine for 10 minutes and then encounters a problem, then chances are it has nothing to do with the intake, or dust or magic FAU gremlins inside of the ducts. It's probably something to do with the motor or controller I think...
-Wayne
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I'm not saying it's not an ECM issue but again, if it will cycle properly with the blower door off, it seems to me the issue is in the duct. If this was a new issue I'd say Yep! It's the ECM. But seeing how this code dates back several years based on the writing on the cover, I'd say this thing has had an issue since day 1 and the tech changing the filter was just to say they were doing something to fix the problem. His next move was probably to whack something with a screwdriver.
BTW, there is another member here who is really well versed in this furnace. I don't recall his name but I remember him chiming in on another thread. I'll see if I can find his username. You might be able to PM him for advice.
Update: I found him and sent a PM asking if he could chime in.