Dometic AC stops cycling

Discussion in 'Towing, Vehicles, Maintenance and Repairs' started by Handeman, Jul 21, 2017.

  1. Shane262

    Shane262
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    I hate to bring up a year old post, but I'm having the exact same problem. I changed the thermostat with no results. Did you ever find out what the problem was with yours.
     
  2. Bama Camper

    Bama Camper
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    I had the same problem - exact same symptoms. The sequence of events was - the AC runs until the coil freezes up. The freeze protection sensor cuts the unit off and won't allow it to cycle back on. It won't reset until the thermostat is manually cycled off then on again and the process repeats. If the ambient temp is low enough for the AC to keep up with the set point, the system works fine. But when the outside temp increases and the AC can't keep up, the coil freezes and the problem starts. This sequence doesn't happen when the fan is on (continuous fan) because the coil doesn't freeze.

    One earlier poster commented that it may be low on freon. Low freon will cause a unit to freeze up, but so will low air flow. In my case the problem was an air dam between the input chamber and the output side had fallen out of place and allowed the output air to recirculate back to the input chamber. A couple of sheet metal screws and some aluminum tape fixed the problem. I think this is a common problem with Dometic units.

    This is a pretty easy fix (or just to check) if you are up for it. You'll have to pull off the faceplate from the AC unit - 4-5 screws , the filter and the knobs. Check the position of the air dam to make sure there are no leaks between the input chamber and output side. The air dam should not rattle or move when you push on it.

    There are other reasons the unit will freeze up, but that's a pretty easy check. If it's freezing because of low freon, it's difficult because these are basically "throw away" units. I don't think most of them even have access valves.

    Good luck.
     
  3. mdcamping

    mdcamping
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    Check the temperature differance (after running for 5 minutes) between entering air and leaving air, , should be 17 degrees or better. If not (as mentioned) a leak or possible compresser issues as both will give the same results.

    yup I almost agree the units are throw away. That said the units can be sometimes repaired or at least serviced to get by for a few yrs. Of the two mentioned above more likely a leak, sometimes either a local rv service shop or even a local A/C contractor where you can drive to, they can put on a Tap-A Line/saddle valve and put in a few ounces of gas for maybe $150. once the charging valve is on the next time cost/labor should go down somewhat.

    Mike
     
  4. Northflnurse

    Northflnurse
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    Did you ever figure out what was wrong? My husband uses our camper for work, and he’s having the exact same problem you are, and ours is only 6mths old. It’s under warranty, but unfortunately Camping world can’t even help him for almost a month
     
  5. docj

    docj
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    With all due respect, you've responded to a thread that is a year old. The participants may not be active on the forum at this time. You would be better served by creating a new thread about your particular problem.

    Joel ((AKA docj)
     
  6. Cavscout

    Cavscout
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    I have a 2018 EVo dometic air conditioner with the same issue..called support ect..no fix. After stumbling upon a youtube video of a guy with same issue and found a fix.
    If you remove the air filter cover for intake you will see a white foam insulation towards the vent side of aircondtioner. It is held in place with double side sticky tape (kinda cheesy). I guess with the air pressure when you switch from down vent to ducted vents it causes it to come loose and sends cold air back into intake. I used gorilla tape to keep in place after making sure it is seated properly..sure hope this helps
     

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