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Old 08-10-2015, 06:57 PM   #1
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Dometic fridge propane issue.

A puzzle for all you propane experts. My fridge, a RM3962 Dometic has me puzzled. It works fine on electric. No problem.
When I switch to propane (which I prefer) it lights and stays lit until the set temperature is reached. The flame then shuts off until the next cycle calls for more heat (to cool) and it will not re-light. The flashing message shows "LP" "E1". In my user manual the E1 message means "hardware fault in the gas operation system". When I asked my local RV tech, he simply and quickly said it will need a new circuit board, $300 to $400. I feel this is not the case as a gas hardware fault is not a circuit board. A message showing E2 indicates a electronic circuitry issue.
Any suggestions would be most appreciated. I'm going to Bristol for the race next week and would like to have the propane working. Also, what is the proper location for the temp sensor inside the fridge. I have mine on the second fin from the right and at the top. Correct?Click image for larger version

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Old 08-10-2015, 07:05 PM   #2
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I would Google Dometic and call their support group with the Model/Serial Number. There could be a recall that your dealer is not telling you about or does not know about. In any case, the factory people will know what the problem is.
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Old 08-10-2015, 07:15 PM   #3
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Could easily be a circuit board problem since it's detecting that there is no flame. There are also a fuse or two inside the "black box" on the back of the refer. Don't know your particular model though.
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Old 08-10-2015, 08:02 PM   #4
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Failure to light on the 2nd go-around is sometimes heat related. Everything heats up during the initial cooling cycle and wires and circuit boards expand a bit and change characteristics ever-so-slightly. Sometimes it is enough so that they no longer work. That might be why the tech says "new circuit board". But to say that without any real diagnosis is asinine, in my opinion.

The circuit board is very much involved in gas operation. It opens the gas valve and initiates the spark ignition (DSI) device to light the burner, and then waits to detect a successful light (flame sensed). If it does not get conformational of a gas flame, it will shut off the gas valve to prevent a gas leak. Can you determine if there is any attempt to light? You should hear 3 clicks from the igniter and you can open the outside access door and watch it try. If there are no sparks, either the baord is bad or the igniter itself (including its wire). If it tries to light but does not, it could be an actual gas flow problem. If it lights but then gets shut off in 15-20 seconds, the problem is that the flame sensor did not report back to the circuit board to say a flame is present. That is usually a sensor or corroded wire problem.
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Old 08-10-2015, 09:05 PM   #5
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Quote:
Originally Posted by Mr_D View Post
Could easily be a circuit board problem since it's detecting that there is no flame. There are also a fuse or two inside the "black box" on the back of the refer. Don't know your particular model though.

Thanks guys for some valuable insight. Gary, you have given me some things to try before admitting to the faulty board. I'll be at it in the morning.
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