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Old 09-05-2013, 01:25 PM   #1
J J
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Dometic Refrigerator DM2852RBX Issue

My refrig. will lite on gas but after 30 seconds the igniter starts trying to lite a burner which is already burning. Once the igniter stops the gas valve shuts and the flame goes out.

I understand there is a thermocouple used for flame detection. I cannot locate the T/C on the refrigerator or find the T/C in the literature I have, on my unit.

Can anyone confirm there is a T/C used for flame sensing? How is it connected to the control board? Is there a wiring schematic showing the T/C, in the circuit?

If a T/C is not used, how is flame detection monitored?

Any help is appreciated.........
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Old 09-05-2013, 02:20 PM   #2
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No thermocouple on modern units. It's done by reading rectified current (caused by the flame) on the same electrode that is used for throwing the spark. Google "flame rectification" for more details. Either that electrode is not in the flame, or the burner assembly is not well grounded, or you have a control board problem.

Edit: You should also try taking some sandpaper to the electrode to make sure it doesn't have any corrosion on it.
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Old 09-05-2013, 03:27 PM   #3
J J
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Thanks for the info. Dometic told me there was a T/C. Knowing what a T/C is and the principle on which it performs, I couldn't find one. Your information confirms what I was thinking. The igniter is working as a flame rod, producing a voltage, measured by the control board.

Thanks again, I will check the grounding, igniter alignment and for corrosion.

Is there an easy way to do this with out pulling the refrigerator out of the trailer?
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Old 09-05-2013, 03:33 PM   #4
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You should have an access panel on the outside of your RV which provides access to the back of the refrigerator. They are vented to allow for combustion air and condenser cooling airflow.
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Old 09-05-2013, 03:56 PM   #5
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Here's the manual if you don't ready have one. See especially page 14.

Dometic DM2852
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Old 09-24-2013, 12:53 PM   #6
J J
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Barry,

Just want to say thanks for the info.

I ordered a control board and received it. I also took the burner assembly apart and it was very clean. Changed the control board and the gas system now works as designed.

The funny thing about the refrig. is the check light never came on. Best news is the problem has been resolved......thanks
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Old 09-24-2013, 01:35 PM   #7
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Glad to help. It's great to hear that you got it working!
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