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Old 07-02-2016, 01:44 PM   #1
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Dometic fridge won't run on 12v DC.

Need help diagnosing my model DM2652RBX 3 way fridge. It will no longer run on the TV 12v as it used to. It tries to light as though the gas mode is selected (which its not) and should then click over to the 12v. The element is fine because it all runs fine when we have full hook ups. I've checked the 2 fuses behind the box and they're fine. Meyer reads 13-14v DC when connected to the TV. So is there another fuse somewhere that I can't see? Something else I'm missing?


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Old 07-02-2016, 03:08 PM   #2
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if I think you're saying what I think your saying..i'm having the same problem.

Assuming you have gas, line is bled, you turn on the fridge without shore power and it should click (the igniter) and light the propane which runs the fridge. (on shore power there is an electrical heating element that runs).

I replaced my ignitor and no go - would not light. I can light it manually (requires pulling a few tin guards to get to the burner) and as long as it's on, it runs. But it won't 'self ignite'.

I've not been able to get an answer to my issue - if your's is the same maybe together we can find it.
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Old 07-02-2016, 04:02 PM   #3
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The OP says it is a 3 way fridge (ac/dc/gas) and it's the dc (12 volt) portion that isn't working. I didn't know these types were still in existence. Anyway, if I'm correct not the same issue as yours.
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Old 07-02-2016, 04:43 PM   #4
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can I assume it works on the same principal - so the 12v heats an element that runs the fridge.

So if you have 12v at the element and no heat there, then you need to disconnect the element and check the resistance. if it's zero (no resistance) then the element is broken/burned out and needs replaced. Yoy'll need to find the spec for how much resistance there should be in a good element.

This may help
http://www.fourwh.com/NewDometicRefrigeratorManual.pdf
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Old 07-02-2016, 04:56 PM   #5
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Quote:
Originally Posted by JCamper View Post
The element is fine because it all runs fine when we have full hook ups. I've checked the 2 fuses behind the box and they're fine. Meyer reads 13-14v DC when connected to the TV. So is there another fuse somewhere that I can't see? Something else I'm missing?


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A 3 way has 2 electric elements, one for AC mode and one for DC.
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Old 07-02-2016, 05:10 PM   #6
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from my link above - |
note:
the
dc mode is a holding mode not a full cool
-
ing mode.
dc should be used once the unit is cooled
down and constant supply of
dc available (driving
down the road).
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Old 07-02-2016, 05:18 PM   #7
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A DM2652 is only a 2-way fridge, not a 3-way. At least according to all the service and owners manuals I can find.

However, If the element is good and the relay is engaging, there's a 30 amp inline fuse between the 12v+ and terminal 30 on the relay. I'd check that fuse to be sure it's good.
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Old 07-02-2016, 11:57 PM   #8
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Never heard of any PT product with a 3 way fridge.
Those are normally only in folding trailers and truck campers.
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Old 07-03-2016, 12:56 AM   #9
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This particular model seems to not be available when you look on the Dometic site. It is a 3 way because we've had the trailer for 4 years now and know it has the 12v DC. It's worked until now.
The heating element has 120ac And 12v DC listed on it.
I'm not sure how it uses the same one. What I can't find is a blade fuse, or any fuse for that matter related to the 12v DC. I see a 3 and a 5 amp bus fuse but both have AC listed above them.

Anyone m ow where the fuse might be? It's also NOT in the main breaker in the trailer.
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Old 07-03-2016, 01:24 AM   #10
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Most RV fridges are AC or propane. They use the 12 volt for the controls & to fire the ignitor for the propane & that's as far at the 12 volt go, so if you're trying to make it work with just 12 volt it's not going to happen. Make sure the propane it turned on & the lines are bled from any air that entered when connecting & it should run unless there are other problems. Does the fridge work on shore power?
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