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My ac comes on in my RV and runs for a about 15 minutes and then the fan shuts off and finally the compressor shuts off. this happens before reaching the cooling temp. When it comes back on the fan does not come on at all and you can just hear the compressor hum

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The Fan topside , Is the one working? The one that blows on the condensor? If not, your compressor can be trying to start against high head pressure. Ck the other fan, not the one that blows inside, the other one.It cools down the condensor and if the pressure is too high it will hinder the compressor. Good Luck

Posted on Sep 12, 2009

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2 Answers

Turned ac off while running well turned back on to soon


shut unit off and wait at least 5-10 minutes before re-starting. do not want compressor to struggle to start. good luck!

Jul 08, 2015 | Dometic Rooftop RV Air Conditioner

4 Answers

My domestic rv ac unit reaches the temp setpoint and the compressor shuts off but not the fan, it just keeps on running. Is this normal or should the fan shut off also?


Set fan setting to auto and not high or low setting. Fan will cycle with compressor after setting set to auto or " au" if a digital thermostat.

Mar 21, 2015 | Dometic Rooftop RV Air Conditioner

1 Answer

I have a issue with my 2 Dometic DuoTherm air conditioners. The rv is a 2014 Palamuno Saber 50 amp fifthwheel. Ok. They cool very well but at different random times the compressor shuts off while the fan...


how long a power cord do you have and what size conductors are in it. when a a/c shuts down do to thermostat reaching its setting then trys to start back up shortly the pressures dont have time to equalize resulting in high amp draw. if fans runs all the time instead of shutting off with compresser it will call for cooling fast. i have a 2003 cardinal with 2 a/c's the smaller one has a continous fan & the larger one cycles fan with compressor. i have power cord rated for 50 amps. 110 to 115 is still a low vooltage condition.

Feb 21, 2015 | Dometic Heating & Cooling

1 Answer

Dometic roof top AC unit compressor turns on even if T-stat is off. Only way to get the compressor from turning on is to turn the breaker off. Unhooked T-stat wires to see if issue was there but the...


Sounds like you may have a couple of problems there. First, have you checked incoming voltage to make sure you are getting 100-120 VAC at the AC control board in ceiling? If that's ok, try removing/disconnecting Ac compressor wire at ceiling control box and see if compressor shuts off then. May be a capacitor for compressor going or shot, and possibly relay in control box sticking, or bad wiring to thermostat. Have you had any lightning in the area prior to all this happening?

Jan 23, 2013 | Dometic Rooftop RV Air Conditioner

1 Answer

Duo-Therm ac when the temerture is reached the fan will shut off but the compressor stays running


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

Jun 10, 2012 | Dometic Rooftop RV Air Conditioner

2 Answers

Duo therm mod. 57915 air conditioner seems to work good , runs for 4-5 minutes then kicks breaker , was kicking 30 amp breaker at camp ground , i've been working on connections to make sure its...


Unit may pull as much as 17-18amps when compressor starts up, but level out to 12-15 amps when up and running. Keeping in mind that is all relative to proper 120v incoming voltage, heavy enough wire to run the application etc. If your AC unit needs cleaning , it may draw an extra amp or 2 . With that said, when your at the park, first thing I'd question is their incoming voltage to RV, and try running fridge etc and anything else on propane if possible. The AC alone should not cause 30amp at source breaker to trip, before 15 0r 20 amp breaker in RV that is connected to AC trips. If it doesn't trip your breaker at home, and all is connected same at park, then I certainly would suspect bad breaker or voltage/wiring at park is the cause. P.S. I noticed you said you have 12 gauge wire (rated at 20 amps) connected to a 20amp breaker at panel, but RV is plugged in to a 15amp receptacle, I will assume with a 15 amp adapter from 30 amp plug. Do you see any hazard regarding 15 amp rating on receptacle? ( just a little advice.)

Aug 15, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

Relay (?) sticking Dometic RV rooftop AC


Go up on the roof of the unit and remove the AC Shroud. With the unit running, see if you can pinpoint where the sound is coming from. The only thing on the entire AC that would make that much of a vibration would be the fan motor. Not sure what would cause the fan motor to do this. The compressor may do that but only if the windings are bad and then it would not be cooling.

Jun 30, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Dometic RV A/c compressor runs every 10 minutes


Looks like the fan is jammed or a coil has burnt out, resulting in heat which when detected by the thermostat, passes the compressor to star, but since the fan isn't working it manages to drop the temp near the sensor causing the compressor to shut down & restart quickly. Get the fan repaired/replaced at the earliest & don't use the m/c till then....sodeep

May 16, 2009 | Heating & Cooling

1 Answer

RV Rooftop AC Unit


Sounds to me like your fan is hitting something
Remove the cover and turn the fan by hand ( with the power off ! ) See what it is hitting

Oct 24, 2008 | Dometic Rooftop RV Air Conditioner

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