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Old 02-06-2015, 10:21 AM   #1
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fridge too cold

We've a Dometic model RM2652 fridge that has now gets way too cold
We keep a thermometer inside it to monitor temp & recently it's gotten to as low as 23 deg before I turn off the power & allow temp to slowly rise to normal range
Search didn't yield an former threads w/ same problem
Manual offers no advice about overcooling - only deals w/ if it gets too warm
I checked both fuses (3 & 5 amp) & they're fine
As only interior temp control is that poorly functioning slider, I think the thermostat is pre-set & it may be the problem ???
Would appreciate any advice on trouble shooting & fixing this problem.
Thanx
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Old 02-06-2015, 07:53 PM   #2
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You are correct, the temperature control is preset, however slider may influence it.

That said, if you see a real 23 F, there is nothing you can slide it to get that cold.

The fridge has a limp mode so to speak. If it cannot sense anything, it runs none stop in a last ditch effort to keep your food cold.

Quote:
Doemetic states:

Limp Mode:
This control system contains a feature where it will continue to operate the cooling system in event of a failure of a major operating component. If the control cannot read the temperature sensor and control to the preset temperature, then the control will run the cooling unit continuously at the energy source available. The refrigerator will continue to operate in this mode indefinitely or until a new sensor is installed and the system is reset.
If this is the issue, it can point to these things:

The thermistor (temp sensor) if not working correctly, Maybe loose wire.

The control board has issues.

Do you have an ohm meter? You can test the thermistor in a cup of ice water. Should get 8,000 to 10,000 ohms when the sensor is in ice water for 8 to 10 minutes. Unplug it at the control bard, connection P2 and test at the wire leeds from the sensor.

Hope this helps

John
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Old 02-06-2015, 08:00 PM   #3
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Glen,

Here is the service manual. Sunline Coach Owner's Club - Sunline Owner's Files - Dometic Service Manual

Page 58 talks about the ice water test.
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Old 02-06-2015, 08:17 PM   #4
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Glen,

Have you noticed the problem on gas, electric or both? If it is the sensor, it should not matter as the sensor controls both. But if it only does it on one mode and not the other, that is a good piece of into to know. That points elsewhere.
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Old 02-08-2015, 09:51 AM   #5
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John
Thanx for all the advice
Haven't yet checked if problem persists in AC mode but did buy a replacement thermistor yesterday.W/ some help from a fellow camper here in the Imperial Co CA desert plan to get it installed today. He also has a spare circuit board w/ identical part # as mine so we'll try that if new thermististor doesn't do the trick
Thanx again. Will post reults
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