Dometic Fridge Flame | Dometic LP Gas Operation | RV Fridge Flue Cleaning | Troubleshoot

This page is to help troubleshoot your Dometic RV refrigerator if it is not working on LP Gas mode.

Table of Contents
LP Gas Burner, Igniter, Jet, and Flue

Complete RV Fridge Repair Video Series

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

Dometic Gas Igniter

Dometic Fridge Flame & LP Gas Igniter Troubleshooting

RV Fridge Flame Adjustment -- Arc Gap for Easy Ignition

Referencing the photo to the left, a gas igniter arc is shown, the ark is jumping from an electrode to the LP Gas burner. Please note, your burner will have only one electrode, this photo shows two electrodes, we used two electrodes for experimentation and development of the Fridge Defend by ARP.

Dometic Flame Adjustment

RV Fridge Flame

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

This figure shows a Dometic gas flame properly ignited. We used the two igniter electrodes to demonstrate a method for determining the proper adjustment of the igniter electrode. Note that the electrode on the left has a very small portion of its tip glowing red due to the heat from the gas flame. The electrode to the right has a much larger area within the gas flame, thus more of its tip is glowing red. The right electrode is adjusted too far into the gas flame. When the electrode is adjusted too far into the gas flame, the burner is harder to ignite; in addition broad spectrum electrical noise is introduced into your electrical equipment, please click here for more on LP Gas igniter noise and your RV wiring . This phenomenon is due to ionizing the moisture in the air. Maybe next time when RVers take their fridge to a RV refrigerator repair shop, they will think of adjusting their fridge igniter when installing a cooling unit or working on the burner assembly .

Dometic Electrode Adjustment

The Ark Gap

Referencing the figure to the left, this is a typical gas burner assembly front view. The two red lines represent the burner flue. Most manufactures have a specification for distance 'd', which is the distance from the igniter to the gas burner assembly, generally a wider gap is better, 1/4 to 3/16 inch . What is not discussed is the fact that the igniter should not be striking the arc within the flow of gas issuing from the burner as a rule of thumb. This figure shows the arc passing at about a 30° angle from the electrode to the burner assembly. The arc should not be directly inside the area where the gas flame is. Trial and error may be the best method to adjust the electrode in some cases. Just observe the location of the arc when the LP gas has been turned off, then turn on the gas and make sure that the arc passes through the open air into the location where the flame is observed. Put the cover on the burner, it should take one to three strikes of the arc to ignite the gas flame when the gas pressure is correct, the burner assembly is aligned with the jet properly, and the electrode is adjusted correct.

RV Fridge Flame - LP Gas Maintenance

The use of propane as a heating source for your Absorption Refrigerator allows you to use it pretty much anywhere at anytime.

The proper propane pressure to your various devices should be checked and adjusted by a qualified service technician in a RV refrigerator repair facility that understands the importance of maintaining proper pressures and how to accurately measure that.

If you have an issue with either the igniter not properly lighting your propane, or the flame isn't the proper blue color - please seek a qualified propane repair technician immediately! Be sure to turn off your propane at the tank until this is resolved!

Make sure the propane regulator is set at 11 inches of water column. Please use this link to read more on Manometers

RV Refrigerator Maintenance LP Gas Flame

Flame Adjustment

Referencing the photo to the left, the flame alignment should be in the center of flue.

Clean the flue before use after long storage or non-use of your refrigerator. An important part of RV refrigerator repair is to make sure that bugs have not made nests inside your flue. These nests can be very hard to remove.

Always open the doors of the refrigerator during storage to allow moisture to evaporate. Condensation can be trapped in the insulation of the refrigerator and rot the cooling unit evaporator.

These little tips of RV refrigerator repair and maintenance will help keep your refrigerator very efficient and safe - and you - a happy RV'er! Refrigerator troubleshooting and maintenance are critical for a long life for your fridge.

A wonderful RV supplier provides the Factory Service and Owners manuals right online - Bryant RV Services.

The Science behind LP Gas Ignition & Electrical Noise

What Happens when the LP Gas is Ignited?

The air around the ark and gas mixture is ionized (more on this below), that ignition of the flame is a 3 step process, plus a 4th step that kills your controllers by introduction of electrical noise if igniter is not adjusted properly:

1) Arc passes through air and LP gas mixture.

2) Arc ionizes the moisture in the air.

3) Ionized moisture in the air decomposes the LP gas to where it will not ignite.

44) An electrical potential creates an RF field by the frequency of the arc and the inrush of ions from the free air to balance the electrical potential created by the process.

Too summarize the flame ignition process, the following steps occur:

1) An arc passing from one electrically charged electrode to another is due to the gas becoming a conductor of electricity. In this case, the gas is a mixture of air & LP gas. For the flame to ignite the ark should pass from the air into the air/fuel mixture.

2) The gas in the space between electrodes becomes ionized (positively charged by removal of one or more electrons).

3) Ionized gas is called plasma. Plasma is the 4th state of matter, where the states of matter are as follows: solid, liquid, gas, and then plasma.

4) Research by S. A. Arrhenius showed that molecules in solutions would dissociate and migrate (travel) to the electrodes of opposite polarity. For more information on this subject visit: S. A. Arrhenius

5) The molecules that become charged by the electrical arc will encounter ions of an opposite polarity, or a grounded surface, at which point they lose their charge. Thus return to their original molecular state which is without a positive or negative charge.

The following discussion is for individuals that are having problems with ignition of the gas flame.

An improperly installed igniter can result in electrical noise that can disturb other electrical equipment in your RV. If you are not sure about if your igniter is functioning properly, take your fridge to a RV refrigerator repair shop to have it check up. RV fridge flame adjustment is critical for proper function of you fridge.


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