Quote:
Originally Posted by cabmando
http://www.graycoolingman.com/uploads/1/0/6/6/10667336/58mvp-_2_stage_variable_speed_troubleshoot_guide.pdf
Open the troubleshooting guide and go to page 13 for Fault code 12. You can scroll from there to find the fault code and the troubleshooting steps recommended for fixing the issue.
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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I did both - test mode with the blower door open and test mode with the blower door closed. No errors with the door open, and errors with the door closed.
I think the system is marginally designed and I might modify it. I just don't want to make it worse! I think shortening the return flex is a good idea, and performing a good cleaning on the intake vents, and trying to modify them to get a good path to the intake is key. I'm not sure if they made this so long and convoluted on purpose though? Seems ass-backwards to me - shouldn't you want a return path with as low restrictions as possible?
-Wayne