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 Pressure and Filter Video

Complete RV Fridge Repair Video Series

Please click the image to the left for our Complete RV Fridge Repair Video Series.


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.


Dometic Gas Valve Assembly

LP Gas Jet or LP Orifice Cleaning - Dometic does not cool on gas

This drawing shows the following (starting from left):

The inlet has a ceramic filter within the body of the valve assembly.

There is a shutoff valve that aids in testing the igniter and other functions.

A test port is provided to test the gas pressure at the burner jet.

The solenoid operated valve (SOV) turns on/off propane, it will click when turned on.
The valve requires 12VDC to open. If the valve has 12VDC but does not click, remove the two wires, the ohm measurement between the terminals is from 44.1Ω to 53.9Ω.

See below, the burner jet can plug with oils and other contaminates.

At least one mounting screw should have a ground wire that grounds the burner to the controller.

The spark electrode gap is described above, and to the right in drawing.

The burner tube is what the spark should jump to from the spark electrode.

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.


Look into Light to see Dirty Burner Jet

Dometic Gas Jet Plugged

Clean Burner Jet

Dometic Gas Jet Clean