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:
Thanks for the replies. I have been reading Doug for years and appreciate all the help he has offered.
One thing that quite surprises me is that the signal from the thermostat to the C term on the unit has no(.8V) voltage on it. I expected to find a B+ voltage there. Why no voltage?
I believe the "C" terminal is the common thus no voltage on it . . . I could be wrong
The c wire is an extra wire that can be used to provide a return path for continuous power for any application. It's normally used to provide a return path to power the thermostat. The “c” stands for common. It is often labeled as “c” on thermostat backplates.
