Freezer keeps defrosting

[Hydrotherapy7]

I have a 2008 340 Sea Ray. The interior refrigerator is a Waeco. Waeco was taken over by Dometic. The refrigerator works when plugged into AC. After switching over DC the refrigerator appears to be operating. The compressor is audible. After a few hours the freezer defrosts. I contacted Dometic and they told me to check the voltage coming out of the power supply. I checked the voltage and it was 13 volts. I saw previous posts suggesting to change the power supply but don't believe that is the problem. Does anyone have any suggestions?

 

[gerryb]

First confirm that it is operating on both AC and DC. The power supply is a common culprit. Then you will want to check the temperature in the unit when running over the course of 8-12 hours with the thermostat in the mid position. If the temperature is higher than 50, you have a bad thermostat/sensor or perhaps an issue with the compressor.

I wish these units had a little LED light up in the front to indicate when the compressor was actually running along with a temperature readout. THere's a huge profit margin in these Marine Fridge units as the compressors cost less than $100.

 

[DB360]

From a post back in Aug 2021,

After replacing that AC/DC control module box on the frig, which is nothing more than a step down transformer, it lasting 1 year and a week. About 7 years ago I by-pasted that box and connected the battery wires to the frig. These refrigerators need 12 volts. The box just steps down the power from 120v to 12v. Did my freezer about 5 years ago and both running strong. I don't run them when the boat is behind the house here, but if we are loading up days before a trip, then during then trip and when we are unloading the frig & freezer are running this way. Batteries are always being charged. so there is no problem with power at all.

Just my $.02!

D