AC unit humming when I turn off the system.
I have a Dometic brand AC unit with a analog thermostat. When I turn the thermostat to off there is a humming noise coming from the AC unit on the roof. The only way it stops is to flip the breaker. T...
Forum Discussion
blakeb wrote:
Well I unwired the thermostat and turned the power back on. Still had the humming noise so I am assuming the thermostat isn’t the issue like mentioned. I just unwired the cool and the power from the thermostat.
That's probably a sufficient test. If you're feeling up to it, you can open up the ceiling unit (inside the rv), there should be a separate wiring panel to open once inside there, and when open the control board and relays should be visible.
You should also see a similar service diagram like the one previous.
Turn the power on and then use something plastic or wood to bang on each relay. Give it a sharp hard whack. If the relay is stuck that should unstick it and the compressor will shut off. Make note of which one it was, and share a picture with us.
