Air Conditioner runs but won't cool
We have a brand new coleman mach 8 cub and an rv comfort hc coleman mach 7330g335 thermostat. The AC fan runs on both low and high and responds to the thermostat but the air won't cool. For whatever r...
Forum Discussion
adambeck7 wrote:
Doug, no LED's but here's two pics of the board itself and the wiring diagram. within the compressor relay the "NO" (black wire) had power but the "COM" (Purple wire) did not.
The BLACK is the 120 hot feed to the AC board. The Purple goes to the start capacitors. That black box is the relay that CLOSES to supply 120 power to the purple wire. So, If you have it set for COOL and no 120 power to the Purple wire, then the odds are the wiring between the tstat and the control board is open or miswired. It is extremely RARE for a wall tstat to be bad, it is 99% the wiring. It takes 12 volt power to close that compressor relay. In the shop, I would apply 12 volt power to the "Y" spade and see if the relay closes. Before that, I would check for 12 volts on the "Y" feed wire from the tstat. Doug
