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Old 04-19-2022, 09:40 PM   #1
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Dometic DM2652LBX won't switch to AC

OK last Fall just before the Talladega race, our fridge failed due to an ammonia leak. Per several of your recommendations, I went with a replacement of the ammonia evaporator coil unit from JC Refrigeration.

I pulled the fridge out of the hole, laid it on it's front, removed the old unit, installed the new unit, set it upright, slid it about 2/3 of the way back into the hole, reconnected the gas line, 12V wires, and plugged in the 120V.

Turned on the fridge and it worked great. The unit worked on AC power and switched to gas when I unplugged the 120V. Left it running for two hours and the freezer compartment go down to 1 degree F. The fridge compartment was down to the low 40's F. It was late at night so I turned everything off with the intent of coming back today to slid it back out to install the heat shields around the gas burner and flue.

Once I did that and slid it back into place it won't switch to AC. It only works on gas.

My troubleshooting steps thus far are:
Verified the AC receptacle is reading 120V per my multimeter.
Checked the 120 V wires that plug into the circuit board and got 120V.
Checked all fuses on the circuit board and inside the RV. None tripped or blown.
Verified that 12V is on the circuit board.
Checked the resistance of the AC heating element and got 46 Ohms. It was replaced last spring and has only a couple of months of actual use.

Unless you guys can point me in another direction, I'm guessing that the circuit board needs to be replaced.

On gas the fridge is working like a champ. How much gas will I go through over a 5 day NASCAR trip? Should I supplement the two bottles on the tongue?
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Old 04-20-2022, 08:44 AM   #2
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You frig uses very little propane such that you will hardly notice. Have you verified that the element is actually getting 120V with the frig set to AC only?
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Old 04-20-2022, 02:34 PM   #3
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SeaDog,

I'll try that tonight.
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