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dspencer's avatar
dspencer
Explorer
Jul 06, 2015

question about my AC cycling on and off

I have a 13,500 BTU Dometic AC on my 26 BH Gray Wolf that I have a question about. First of all it performs great, just got back from 9 days in South Texas and it got a work out for sure.

I happened to notice that on occasion it will shut completely off and will immediately come back on in a lower output if that makes sense. It doesn't appear to have any other problems but I have noticed it coming back on the fan won't be blowing as high. Then other times you will hear the compressor kick off and then it shuts completely off like normal. The shutting off and then kicking back on as a lower fan speed is a new one to me. This is only our second year with this unit and my old one never did that but it was a different type.

Any knowledge on this would be appreciated.

9 Replies

  • Learjet's avatar
    Learjet
    Explorer
    Jul 06, 2015
    you can easly find it online...but here are the cliff notes ;)

    Fan Speed
    Press the On/Off Mode button until the fan green LED is lit. The
    LCD will show “Lo” (Low), “Hi” (High) or “Au” (Auto). Press the “+” or
    “?” button to select the desired fan speed. See “Special Features”
    on page 11 for more information on Auto Fan.

    page 11:

    Special Features
    Auto Fan
    When auto fan is selected the fan speed will vary depending on the
    difference between the temperature set-point and the room temperature.
    In auto fan the compressor and fan cycle On and Off with the
    thermostat.
    When the difference is:
    >5º The fan operates on HIGH
    <4º The fan operates on LOW

    What they don't tell you is... the compressor will still run while the fan changes speed...also you may have it changing back and forth until the temp is reached.
  • dspencer's avatar
    dspencer
    Explorer
    Jul 06, 2015
    I had emailed Dometic about this situation on Friday and they just let me know that it is operating completely normal. Thank You everyone for your answers.
  • dspencer's avatar
    dspencer
    Explorer
    Jul 06, 2015
    Learjet wrote:
    read the "special feature" in the Thermostat manual...


    I have misplaced the manual for the thermostat. Do you mind me asking what it says?
  • TakingThe5th's avatar
    TakingThe5th
    Explorer
    Jul 06, 2015
    dspencer wrote:
    smkettner wrote:
    This Dometic thermostat? The auto-fan selection will change fan speed depending on the set point vs temperature spread. Yes it sounds like it goes off before coming back on at a different speed. All is normal.



    Yes that is the exact thermostat that I have and is exactly what it is doing.


    X2. Mine does the same thing.
  • dspencer's avatar
    dspencer
    Explorer
    Jul 06, 2015
    smkettner wrote:
    This Dometic thermostat? The auto-fan selection will change fan speed depending on the set point vs temperature spread. Yes it sounds like it goes off before coming back on at a different speed. All is normal.



    Yes that is the exact thermostat that I have and is exactly what it is doing.
  • time2roll's avatar
    time2roll
    Nomad
    Jul 06, 2015
    This Dometic thermostat? The auto-fan selection will change fan speed depending on the set point vs temperature spread. Yes it sounds like it goes off before coming back on at a different speed. All is normal.

  • therink's avatar
    therink
    Explorer
    Jul 06, 2015
    Sounds like it could be a low voltage issue. Did you check voltage while the AC was cycling? Should never be below 108v and is a common problem in some campgrounds when lots of ACs running.

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