Question about Dometic Rooftop RV Air Conditioner
From what you are saying there must be two separate relays that run the fan. The switch or thermostat must run two separate wire from it to something. one wire would be the "on" and the other the "auto". These would have to go to separate relays and the relay for the "auto" is bad...the realys may be on a circuit board and the whole board may need to be replaced.
Best thing to do is to follow the power for each position and find out where the power is stopsing in the auto position and why it is not turning on the fan. It may take a bit of detective work to actually trace down the problem. It could be as easy as a loose connection...
Posted on Sep 29, 2010
If the A/C compressor relay is not starting the compressor then the fan will not run. The compressor should kick on, then the fan will start blowing. But it sounds like you have a problem with the compressor, starting relay, or the starting capacitor. You can check voltage on the compressor side of the relay to see if you are getting power to the compressor. If you are getting power to the compressor then check continuity on the capacitor. Be sure to unplug the unit before testing capacitor. If you have continuity on the capacitor then the capacitor is good. I don't believe this system has a low pressure switch. So this would mean that your compressor is bad.
Posted on Sep 28, 2010
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Posted on Jan 02, 2017
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