HVAC - No Compressor run
The Coleman Mach 3 13.5 BTU HVAC has worked perfectly from 2008 until now. Troubleshooting my RV HVAC unit. The thermostat says COOLING ON. I have fan control from the thermostat, but no compress...
Forum Discussion
Ron Nielson wrote:
Ranger
That's exactly what I did. Jumped 12V from GH (and GL separately) to the Y terminal and there was no response.
I have the situation where one test would indicate that the board has failed (the above test) and another test would indicate that the thermostat has failed (only .8V on the Y term supplied by the thermostat). Seems like an impossible situation unless both the board and the thermostat are defective.
I have ordered a thermostat to see if that fixes the problem. Like I previously said, they're only $20 or so and I need to get this thing fixed. If it turns out that that a new thermostat produces the correct result, I'm done, otherwise, I'll see if I can find a new board. They're pretty scarce right now.
Regardless of the tstat, IF YOU HAVE 12 VOLTS AT THE UPPER CONTROL BOARD ON "Y", THE COMPRESSOR SHOULD COME ON. If NOT, your control board or the Capacitors are defective, NOT YOUR Tstat. BUT if you do NOT have 12 volts from the tstat on "Y", then find where the open is. Do you have 12 volts at the tstat on the wire for "Y"? If NOT then odds are your tstat is bad also. Doug
