Question about Dometic Rooftop RV Air Conditioner

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I have a duo therm rv air conditioner and the fuse blew on the control board. Replaced the fuse and compressor has no power going to it. The heat mode ran furnace but it ran constant no matter setting. Changed analog thermostat and heat problem fixed but no compressor. Fan runs on both speed. Wondering if there is a problem with control board??

Posted by Anonymous on

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  • Dometic Master
  • 1,363 Answers

Sounds like communication cable from t-stat to board bad or indoor temperture sensor failed.

Posted on Aug 16, 2015

6 Suggested Answers

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Posted on Jan 02, 2017

  • 230 Answers

SOURCE: will not shut off

Sounds like a stuck relay on the unit itself. Maybe there is a short in the control wire that comes from the thermostat that activates the fan.

The thermostat probably has one hot wire at all times. The thermostat then chooses which wire to send the voltage down based on your selection. One of those wires is probably for the fan only. Make sure that it is in good condition (no bare, pinched or wires)

Posted on Jun 17, 2008

  • 1 Answer

SOURCE: rv air conditioner leaking

I have the same problem....it is a negative pressure problem holding water inside the unit until it overflows the pan and runs into the duct system. why this occurs....I don't know....I cant find a problem with my air return, but as soon as you turn in off, the water comes gushing out the drains on the unit. I resolved this....temporarily....by twisting up a paper towel into a wick, and placing one end up into the drain tray, with the other end lying well out into the exterior case. This lets the water wick out and keeps the tray drained. I don't understand the problem and don't know what the permanent fix will be, except maybe cutting a hole and placing an intake vent directly below the unit.

Posted on May 11, 2009

  • 508 Answers

SOURCE: i have a duo therm air conditioner think thermostat problem

Google dometic rooftop air conditioning parts!Wouldnt suggest using off brand parts maybe diffrent?if that one is set up for 12v also maybe deffinatley diffrent!!!Try cleaning condensor aluminum fins on roof top if condensor is dirty will throw whole system out of whack!!!use oven cleaner and hose with nozzle be careful not to bend fins throughly rinse off cleaner after soak period spray off completly off roof and sides quickly!!!!!may damage decals etc!!! anyhow try that before replacing parts then use factory or alike parts!!!Good Luck!!!

Posted on Jun 24, 2009

james3751
  • 614 Answers

SOURCE: can my duo-therm air conditioner on my rv be recharged?

These unit can be recharged. 134A. You NEED A SERVICE TECH THAT KNOWS HOW TO CHARGE UNIT.RUS

Posted on Jun 25, 2009

  • 46 Answers

SOURCE: Duo-therm fan only runs on low

useually a sticking fan relay in the controll board this is the closeest unit to a home based cenral air system and i would leave this one to the experts if you want to trouble shoot there is a detailed wiring diagram on the back side of the pc board cover on the fan and compessor unit it self there is a seperate relay for each speed on your unit make sure getting power to selected relay if not trace wiring and do continutity tests back to themostat

Posted on Aug 01, 2009

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Is this a wall mount thermostat or manual control unit? What is the model of the air conditioner? The only way that this is going to happen is that power is jumping somewhere to the heater coil from the cool side.

If it is a wall mount thermostat, the yellow wire is the cool mode (compressor on) and both the tan and blue wires are the fan mode. The orange wire is for the heat strip. So if you set the thermostat on High/Cool, then you should have power at the yellow and blue wires, not the orange. If the orange wire is energized, then there is a problem.

Remove the orange wire from the thermostat, try it again. If the breaker trips, then remove the wire from the connection at the relay board. Once again, try the unit. If the breaker trips due to the same problem, then it has to be a bad relay board. If the breaker does not trip this time, then you have problem with your wiring between your thermostat and the control unit.

Sounds like you don't have manual controls since it has a relay board.

Hope this helps,

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