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:dougrainer wrote:
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
I would like to temporarily wire around the relay long enough to verify that the compressor will physically run. I think I just need to add a short connecting wire between the 110V input and the relay output circuit. Don't know what I might be doing to the balance of the board, if anything, just don't want sparks and fire. OK to do that?
Yes, I will test the actual output of the thermostat by disconnecting that wire from the board.
The compressor runs fine. Nice to see that I don't have to buy a new HVAC system, although I would prefer to have a 15K instead of the current 13.5K.
I'm now thinking that both the thermostat and the board (maybe just the relay?) are bad. The new thermostat should arrive in a couple of days.
