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Old 05-13-2012, 12:53 PM   #1
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Dometic RM2652 problem

I just replaced the cooling unit and the heater element. It works ok on shore power but when it goes to butane it won't stay lit. It comes on for about 30 seconds then goes off. It does this several times then gets err and stops. How can you tell if the thermocouple is good or bad? It must be sensing that there is no flame therefore the thermocouple or the board?
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Old 05-13-2012, 03:22 PM   #2
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The thermocoupler should produce 25-35 millivolts when connected to the lower circuit board once it has heated. Anything less will cause either erratic gas operation or shutdown.

It is also possible that the flame failure safety valve (combo electromagnet and thermocouple switch) is not working properly. If it fails to produce 14 to 30 millivolts the electromagnet will close and shut off the gas. The internal magnet is usually the culprit and the whole unit must be replaced. If present, it is mounted to the aluminum flue collar just above the burner.

You may have both thermocouple parts if the recall was applied to your RM2652.

It may be silly to ask, but did you ensure the probe tip is properly located above the flame?
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Old 05-13-2012, 05:51 PM   #3
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One other possibility is air in the line and it will take several attempts to purge the air.
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Old 05-15-2012, 10:44 AM   #4
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Thermo couple

Thanks for the input. I don't see any voltage at the leads off the thermo couple. Guess I'll just replace it.
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Old 05-15-2012, 04:21 PM   #5
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You have to heat the thermo coupler for the circuitry to close the connection in the tip. A hair dryer held real close works just fine. It should trigger around 100-115 degrees, maybe a little higher. Or, you can take a measurement when the flame is lit.
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