Shut off automatically, and I run it in fan only mode

DuoTherm by Domestic-Fan runs, no cold air - iRV2 Forums

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Jan 22, 2012 - 12 posts - ‎4 authors Duo Therm by Dometic 13500 BTU air conditioning with ducting, furnace. I. ... If the fan runs but no cold air and the compressor feels like it is ...

A/C just stopped blowing cold.....any ideas??! - RV Forum

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Jul 27, 2008 - 23 posts - ‎6 authors We have run it continuos like this before without any troubles. Thanks for the help! ....When you switch the AC unit on, the fan runs, but the compressor doesnt fire up. You used to be able ... You can find Dometic here. Logged. Dometic Duo Them Air Conditioner Cycles
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try replacing capacitors

Sounds like you hit it on the head--compressor should turn off when unit reaches the preset temperature.

Hi, Sounds like your fan motor has gone bad...
Here is a tip about trouble shooting your air conditioner...

Air Conditioner Trouble -Review the Possibilities
http://www.fixya.com/support/r3571569-air_conditioner_trouble_review_the_possi

heatman101

Have you tried fan in auto mode? I'm thinking fan is set to on, rather than auto.

It may not be wired for low & high fan mode. If it always did before, then yes there's a problem.

The click that you are hearing is the relay control board in the rooftop unit. This means that you are getting 12V to the board. It sounds like you are not getting 120V to the AC unit. Check the breakers in the breaker panel to make sure they are OK. If they are fine, then turn off the AC for 5 to 10 minutes and try again. There is a thermal protection device in the unit that prevents you from turning it right back on after a shut down. Try putting the thermostat to fan only operation. If the fan does not come on in fan only mode, then you have thrown a breaker.

Hope this helps,

Jeff

my duo therm air works beautifuly all day but at night when we go to bed it seams to turn on and shut off rapidly. what could be wrong?

I suspect that you have a bad selector switch for the on, off, low fan, high fan operation. If the selector switch is put into the off position everything should stop completely.