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Old 06-13-2016, 05:27 AM   #1
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Dometic RM3962 reefer cools fine on elec not propane

My refrigerator cools just fine when operating on 110v but when running on propane takes a long time to cool or if already chilled will warm up a good 10-15 degrees within a few hours. I've replaced the burner assy (which glows a nice blue flame). I've added a thermostatically controlled vent in the chimney to draw warm air out. I've adjusted the thermistor. I contacted Dometic's technical service hotline and they say it's 'normal'. I doubt that's true because anyone that dry camps on battery would have spoiled food and warm drinks within hours. As an example, if I have a refrigerator compartment chilled to 36 degrees on electric and switch to propane either rolling down the road or if the trailer is in my driveway, the compartment temps will rise to 46-50 degrees....or more! I've verified that with a remote indoor\outdoor digital thermometer.The old Norcold in my Jayco TT never had that problem. The boiler when running on propane is HOT to the touch. The absorber tubes are air temp or slightly warm at best. Does this indicate a blockage in the cooling unit somewhere? If a blockage is suspected, wouldn't that be the same issue even when running on 110v? I've puzzled and puzzled until my puzzler was sore.....
Any thoughts? Mike
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Old 06-13-2016, 02:39 PM   #2
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I've never heard that it's normal for the fridge to warm up when running on propane. Ours runs about the same on propane or electric.

I doubt that it's a blockage in the cooling system, but it could be something wrong with the gas flue to where it's not heating the refrigerant correctly.

Have you checked the baffle in the flue tube?
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Old 06-13-2016, 08:13 PM   #3
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No, I have not done an internal inspection nor have I seen how. it's a new-er round style burner box. What's the procedure?
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Old 06-14-2016, 10:39 AM   #4
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Here's a page out of the service manual for that unit. It gives you the info you need to check and clean the flue tube.

Notice what it says about a dirty flue or a cracked weld.

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Old 06-14-2016, 10:48 AM   #5
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Thanks Bama! I'll give it a try removing the baffle and cleaning out the flue. If it requires removal of my fridge....well I'll cross that bridge when I get to it.
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Old 06-14-2016, 10:58 AM   #6
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Please post back and let us know what you find.
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Old 06-14-2016, 05:34 PM   #7
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Dometic 3962

This sounds like the same problem we had..... Checked everything... I, to thought that the blue flame was an indicator of proper function... not so.... If you don't hear a woooshing sound after the burner lights ( similar to hot water heater sound) then you possibly have a clogged nozzle.. Not fully clogged, but just enough to prevent full power.
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Old 06-21-2016, 10:20 AM   #8
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Quote:
Originally Posted by Bama Rambler View Post
Please post back and let us know what you find.
Ended up being a clogged flue. An air compressor and copper nozzle blew whatever was in there out and now it seems to cool just fine. Thank you for your help!
Mike
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Old 06-21-2016, 06:18 PM   #9
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Glad you got it fixed and hopefully it wasn't too much of a pain to fix it.

Thanks for posting the fix. It helps people in the future.
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Old 06-27-2016, 09:52 PM   #10
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Rattlensmoke,

Did you have to disassemble the flue and then blow it out or did you just shoot some compressed air up into it?
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