Dometic Does Not Cool | Dometic LP Filter | Dometic Gas Valve

This page teaches how to clean the Dometic LP filter when RV fridge does not cool on gas and the Dometic gas valve is open.


RV Fridge LP Gas Filter

LP Gas Filter

Click here to see our video companion to this page on LP pressure adjustment and filter cleaning.

The first photo shows a typical Dometic LP filter in the gas valve. The yellow arrow points to the flare fitting on the gas line. Please do not use compression fittings on the LP gas lines! In order to get to the filter on your fridge, you start by removing the LP gas line.

The red arrow points to an adapter fitting, this gas filter repair is on a Dometic DM2652 valve. The filter is in the area of the blue arrow behind the adapter.


DM2652 DM2852 Gas Valve

The next photo shows the testing of the LP gas pressure so that one can determine if the LP gas filter is plugged or not? The yellow arrow points to the pressure test port with a fitting and pressure gage attached. The blue arrow shows the LP gas on/off valve; please turn off all LP gas when performing repairs. The red arrow points to the general location of the gas filter in this valve.


LP Gas Pressure Regulator

If the above test at the gas valve test port results in less than 11 inches of water column while the fridge is running in the LP gas mode, test the pressure on the RV gas line. Each RV manufacture has a different method for measuring the system gas pressure, please consult your RV user manual for details, or consult an RV repair facility for more information.

The third photo shows a manometer connected to the regulator of an RV. The green arrows show how to read 11 inches of water column on the gage. The red arrow points to the adjustment port found on most RV LP gas regulators. The orange arrow show the on/off and tank switching valve.

Click on this Link for Manometer Instructions


Dometic Gas Valve

LP Gas Filter Cleaning - Dometic does not cool on gas

The last photo shows a Dometic gas valve, if your Dometic does not cool on gas and the filter needs to be cleaned there are two methods for this process. One to remove the valve, the other is to attempt cleaning on the vehicle.  This is up to the judgment of the repair man. A spray cleaner, such as spray electrical cleaner can be used on the vehicle, or by removal we recommend using 98% isopropyl alcohol.

Whenever working on the LP gas lines, perform a bubble test on the gas fittings afterward to make sure there are no leaks in the system. Use extreme caution; always know how to turn off the gas at the source in case of an accident.