Hello I have a Norcold N306RM8 in my 2017 Forest River Cherokee Wolf Pup. Seem to be plagued by carbon boogers building up on the flame probe running on LP. What causes them? Replaced the burner tube/orifice about a year ago. Recently replaced New Flame probe as it was burned up. Today replaced burner tube / orifice again with a new one to see if that corrects the issue. It seems when there is carbon build up on flame probe the refrigerator does not cool as effectively while running on LP. Thank you,Ken

You are running rich, not enough oxygen. Check the full length of the burner tube and chimney. Make sure it is clear of wasp nest and spider nest. Make sure your flame is not yellow, lastly adjust your flame fuel screw if everything else is clear.

Id checked the gas pressure too. If the pressure is low, the btu input will also be low but it will also draw in less primary air. A dust free, clean orifice is also important, but that doesn’t sound like it would be a problem in your case. Be sure the burner is super clean, so nothing restricts the primary air intake.If it still soots after all that cleaning Id figure out a way to get more primary air… by hook or by crook, there are ways. Craig

"Make sure your flame is not yellow, lastly adjust your flame fuel screw if everything else is clear."Thanks. Flame is blue. Where is this fuel screw that you mentioned located at? Burner tube/orifice is a single piece, and brand new. Ken

C Schomer wrote:Id checked the gas pressure too. If the pressure is low, the btu input will also be low but it will also draw in less primary air. A dust free, clean orifice is also important, but that doesn’t sound like it would be a problem in your case. Be sure the burner is super clean, so nothing restricts the primary air intake.If it still soots after all that cleaning Id figure out a way to get more primary air… by hook or by crook, there are ways. CraigGood idea. I had suspicions about my pressure so I built a manometer and found that my reg not only wasn't regulating, it would drop to 10" with more than one appliance running - the the reg was only 4 y/o!A new American made regulator has everything running perfectly.

KenS999 wrote:"Make sure your flame is not yellow, lastly adjust your flame fuel screw if everything else is clear."Thanks. Flame is blue. Where is this fuel screw that you mentioned located at? Burner tube/orifice is a single piece, and brand new. KenThere is no fuel adjustment screw. I would remove the orifice and make sure it is not partially blocked. I would blow compressed air UP the burner tube to clean it out. If the refer is in a slide room you can remove the burner baffle from the upper vent door. Otherwise you will have to pull the refer to verify Burner baffle and no debris. An EASY check of a regulator without a Manometer is to light the range burners(all 3 or 4). Then run the water heater on LP and the Furnace. IF the range burner flames rapidly pulsate up and down or diminish, your regulator is BAD. Replace it. Doug

Norcold Refrigerator Carbon Buildup on Flame Probe

KenS999
Explorer
Apr 23, 2023
"Make sure your flame is not yellow, lastly adjust your flame fuel screw if everything else is clear."

Thanks. Flame is blue. Where is this fuel screw that you mentioned located at? Burner tube/orifice is a single piece, and brand new. Ken
C_Schomer
Explorer
Apr 23, 2023
Id checked the gas pressure too. If the pressure is low, the btu input will also be low but it will also draw in less primary air. A dust free, clean orifice is also important, but that doesn’t sound like it would be a problem in your case. Be sure the burner is super clean, so nothing restricts the primary air intake.
If it still soots after all that cleaning Id figure out a way to get more primary air… by hook or by crook, there are ways. Craig
eHoefler
Explorer II
Apr 21, 2023
You are running rich, not enough oxygen. Check the full length of the burner tube and chimney. Make sure it is clear of wasp nest and spider nest. Make sure your flame is not yellow, lastly adjust your flame fuel screw if everything else is clear.

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