My dometic caravan 3 way refrig will not operate on d c works fine on 240

SOURCE: Dometic Caravan Fridge 7271

Your refrigerant may have completely separated in the system. Shut of the gas, disconnect the electrical and remove refrigerator from the coach or if you have sufficient room inside set it on a clean area. This operation is what is called burping the system.
1. From the base roll it onto the door and wait five minutes.
2. roll it onto the top and wait five minutes.
3. Roll it on the back and wait five minutes.
4. Return it to the base and wait five minutes.

Reinstall it or test it on electrical. It should show signs of cooling in about 30 minutes in the freezer compartment if the system is not plugged in the boiler.

SOURCE: Dometic RV refrig light will not go out

Open up the door to the freezer, you will see two black switches upper right just above where the door would be when closed. Flip the first switch, then push the switch on the light in the fridge compartment and the light should go out. Thinking that switch is there to help reduce moisture inside fridge, just got pushed by mistake and light remains on. Hope this helps.
Ron1247

SOURCE: dometic refrig not cooling but found yellow oil at service panel

Well first of all there is NO freon in RV refridgerators only ammonia and hydrogen gas, Remove your unit and get aqualified repair person that works on RV fridges. Its ammonia that is leaking.

SOURCE: 3 way caravan fridge wont

I suspect it's either the 240V heater element or the 240V thermostat which has failed. You can test the element by identifying the wires to it and performing a resistance check. The heating element is in the metal stack in the rear of the unit. Use an OHM meter and check for resistance, the higher the better, low or no resistance means the elemnt is bad. Make sure you check all the fuses on the control board also.

SOURCE: electrolux 3 way caravan fridge

Check outlet for voltage ,only if you know how ! if good then cord is bad