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bfourman
Explorer
Aug 03, 2017

Dometic DM2652 not cooling on AC power

Dometic DM2652 2 way fridge, made in 08/09. Last season it worked perfectly. At the start of this season it decided to only work on gas. I have gone through all of the Dometic troubleshooting and finally determined that the board had to be bad. I just replaced the board with a Dinosaur unit and the problem remains.

On first start with the Dinosaur board, it ran on AC for about 30 seconds then started firing the ignitor for the gas. I unplugged the fridge from the camper and plugged it directly into the garage outlet, same story so I know the camper outlet is good.

The AC heater element tests at 41.9 ohm, within range of the specified 44 ohm from the manual. All fuses are good
It runs great on gas, but obviously I would like to run it on shore power while camping.

What am I missing here?
  • Check for voltage at the heater wires while it's running. It rare but you could have an active-open in the element. That is, it measures fine until you apply power and it "opens".
    So if there's 120V to the wires of the element, replace it.
    Otherwise I would check all the safety sensor crud they put on them to stop fridges from burning us down.
  • Can you test 120V on heater wires?
    I doubt you will feel a heat on the tube?

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