This might be "necroing" but its the same AC and relevant information.
I finally got around to replacing the thermostat since I found a maintenance manual and flowchart: http://www.cleggind.com/postal_tech/pdfs/AC2/airxcel_1976376%5B1%5D.pdf
Which led me to replace it. Good news is it has made significant progress, bad news is I have new problems.
When I switch the thermostat to "Cool" the control board and thermostat click incessantly in unison. The clicking varies in speed and sometimes will even stop for about 5 seconds and "run" correctly before more clicking. It sounds as if it is coming from a relay on the board. I suspect the one marked "K3."
The possibly good news is that its clearly putting out cool air, I just cant get it to stop clicking and run uninterrupted.
I'd be curious if there is some diagnostic way to bypass parts of the system, just get power to the unit outright for diagnostic purposes and bypass things like the thermostat.
