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H2oclass1's avatar
H2oclass1
Explorer
Sep 20, 2023

Dometic AC freezing up

My Dometic AC keeps freezing up. The freeze sensor reads 74° all the time, so I replaced the sensor. The new sensor never goes below 73°. I don’t think it would be low on freon or the freeze sensor would indicate that. Any ideas on what I should do next?
  • 30sweeds's avatar
    30sweeds
    Explorer
    Sep 21, 2023
    Compressor relay probably sticking or stuck due to the bad freeze sensor.
  • dougrainer's avatar
    dougrainer
    Nomad
    Sep 21, 2023
    1. There is NO freeze sensor in the condenser.
    2. The Freeze sensor is mounted in the evaporator coil.
    3. What Year Brand Model RV?
    4. What Model AC and what TYPE wall tstat?
    5. HOW are you reading the Freeze Thermister temp? Doug
  • time2roll's avatar
    time2roll
    Nomad
    Sep 21, 2023
    I agree the control box is malfunctioning if the freeze sensor is buried in ice is interpreted as 74/73F.
  • Blacklane's avatar
    Blacklane
    Explorer
    Sep 20, 2023
    There are some trouble-shooting manuals on-line that may help you.

    I assume the freeze sensor goes to a control board that controls the compressor, etc. The next step is probably to trouble-shoot or replace the control board.
  • H2oclass1's avatar
    H2oclass1
    Explorer
    Sep 20, 2023
    In the same place I took out the old one, in the condenser.
    Or in this case in the ice. :)

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