Dometic DM2652 not cooling on AC power

bfourman wrote:
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?

It didn't run on AC..that 30 seconds is time it took to check for AC power and then swap to gas cause NO AC available


Did you verify that the 120V AC outlet fridge power cord plugs into actually has AC Voltage>......plug a lamp in it, TEST it with voltmeter?

Outlet Good....
Verify AC Voltage on board (J5/Hot J6/Neutral)
Then need to check if AC Fuse ON circuit board has blown?
(did you check that on 'other' circuit board before replacing?)

Fuse blown......AC element bad

Fuse good.....check for AC voltage on J7/J8....leads to element (with fridge in AUTO and thermostat setting at MAX so cooling is called for)