AC runs when thermostat is off no fan

[painterbob62]

The rear AC in our 2000 Safari Serengeti runs ( no fan ) and doesn't shut off even with the thermostat in the off position. I have the breaker off to shut it down. It is a Dometic 13.5k. I'm not sure why the fan won't run anymore and why the thermostat doesn't shut it off. Any thoughts would be great. I just put a new 15k Dometic on the front and was planning on moving the old front AC to the rear as it is still working, fan and cool but I'm thinking that the rear Thermo may be bad.

Bob

[spyderRV]

Perhaps the relay which operates the compressor is stuck on.

[DC8Captain]

I have the same problem only my TT and AC are brand new, bought this spring. CW is so backed up in the summer and I don't want to lose camping time so I will have to wait till fall to take it in. For the time being I just use the breaker too.

Dale

[painterbob62]

Thank you all for the replies. I would use the breaker as one of you had mentioned but when I turn the breaker on the AC sounds like it's on but there is no fan / blower.

[gatorcq]

When did this start? What did you do before this started?

[painterbob62]

We had some electrical issues at one point and fried one leg of the 50 amp main breaker. I replaced the panel with all new interior parts and breakers and all works well. Prior to all of this our electrical problem turned out to be a AC back feed through the inverter ( not a good thing ) a GFI plug in the lower storage area had been wired with both AC and invert power and the tab connecting the top plug to the bottom plug had not been separated hence the back feed. It was just prior to fixing all of this that I turned on the rear AC . My wife woke up in the middle of the night and said that it sounded strange. It was running with out the blower going so I shut it down. I moved the front AC to the back ( it worked well ) and it does the same thing. I'm ordering a new thermostat to see if that will work.