Forum Discussion

Charlie_D_'s avatar
Charlie_D_
Explorer
Jul 27, 2017

Dometic AC 15,000 BTU

When running my compressor will drop off and immediately restart. Happens randomly and inside or outside temps do not seem to matter

Thermostat is Dometic digital set on AU. Fan motor continues to run. Fan speed does not change. On start up fans runs a few seconds and then compressor comes on. When temps satisfied compressor shuts off, fans runs about 5 seconds and then shuts off. Has 2 capacitors, neither show signs of leakage. 50 amp unit running on 30 amp cords and voltage when running is 118. Does not fluctuate.

Any ideas?
  • Charlie_D_'s avatar
    Charlie_D_
    Explorer
    Jul 29, 2017
    Spent time in there today for a short period. Did not cycle. Hopefully going on a short trip soon where I can spend more time checking it out.

    I ran the AC with fan on high to get a sense of noise. Then low and then back to AU. The fan runs at the same sound and I assume RPM as low. I will be listening for fan changes and air flow when I check again.

    Question for Doug. Two capacitors. I assume one is for compressor and the other for fan? I assume they are for staring. If so, do they play a role when running?
  • dougrainer's avatar
    dougrainer
    Nomad
    Jul 30, 2017
    The FAN capacitor stays in the loop while the fan is running. The Compressor capacitor just "jump" starts the compressor then kicks out. Doug

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