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Old 04-15-2017, 03:39 PM   #1
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Dometic DMR702 Fridge - No Power

Our Dometic DMR702 fridge quit working overnight, none of the fridge's panel or internal light were operational, completely dead. We are on campground power, trailer battery reads 13.45v. All other 12v lights are working fine, internal fuse panel all ok too.

After a bit of troubleshooting I found the issue to be the 12v thermal fuse (see diagram, item H). It is a 152C fuse with a part number of DF152s (see pic, sorry for the blur). If I bypass it the fridge works and cools perfectly, so here is where I am:

- What caused it to blow? Many theories online including an obstructed vent or burner to just simply a fuse gone bad.

Any other ideas or causes that I can check?

- Read a few posts (not here) about this thermal fuse was part of a Dometic recall dealing with potential issues when running on propane.

Since I'm not running propane can I bypass this safely until I get a replacement fuse?

Thanks for your replies.


PS. Tried posting this question in the Gen Discussion- Appliances section however I'm told I have no rights to that section.

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Old 04-15-2017, 04:17 PM   #2
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In my experience with appliances a thermal fuse will blow when a certain temperature is exceeded and then must be replaced. This is a safety for excessive temperatures. Probably just a bad thermal fuse. I'd replace it and see how it goes. Simple enough to do.
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Old 04-16-2017, 08:03 AM   #3
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Thanks handydc, already ordered the fuse. I was trying to get ahead with info in the event it blows right after I replace it.
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Old 04-17-2017, 07:08 PM   #4
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Same Problem

Came home from the first weekend out. Same thing. Unloading had no lights on fridge.

DMR702 in 2017 Rockwood Ultra Lite 2902WS

Fuse in distribution box was good, but no 12V in distribution box.

Traced 12V in back to same blown thermistor.

I want to replace it. DW wants me to call the dealer. It's brand new picked it up about a month ago. Dealer is only 14 miles away.

Let me know if you have an update frankm.
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Old 04-17-2017, 07:22 PM   #5
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In my case it wasn't the thermistor (C) but the thermal fuse (H). Ordered the fuse and will replace once, if it blows again then taking it in. I'm also under the warranty but dealer is a couple of hours drive.
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Old 04-17-2017, 07:28 PM   #6
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Hi frankm

Sorry I should have said thermal fuse. It is the same one. DF152s

I'll call dealer tomorrow. But order a couple for the road.
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Old 04-17-2017, 07:32 PM   #7
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Amazon has a pack of 10 for $12, free shipping with Prime.
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Old 04-17-2017, 07:34 PM   #8
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Also please let me know what dealer says as to what the cause was or may have been.
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Old 04-18-2017, 01:58 PM   #9
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Dealer says, we probably had a flame out of tube issue while driving. We were driving with propane on for fridge. Thermal fuse did it's job.

My guess, we were headed east in the afternoon in Florida. Just got too hot with sun on the rear (our fridge is in the rear). Will now travel with propane off and let fridge just stay cool on it's own.

Dealer says we should bring it in. Since it's under warranty, do not want issues down the road from self repair. I'll drop it with them next Monday.

I did find the fuses on eBay 5 for $1.99 with $1.99 for shipping. But it is slow boat shipping, not like Amazon Prime 2 day. I will be getting a pack of 5 for spares. Looks like this could end up being a common DMR702 problem as frankm was not driving with his.

We'll see how many days this simple repair takes.
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Old 06-11-2017, 06:30 PM   #10
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Quote:
Originally Posted by frankm View Post
Our Dometic DMR702 fridge quit working overnight, none of the fridge's panel or internal light were operational, completely dead. We are on campground power, trailer battery reads 13.45v. All other 12v lights are working fine, internal fuse panel all ok too.

After a bit of troubleshooting I found the issue to be the 12v thermal fuse (see diagram, item H). It is a 152C fuse with a part number of DF152s (see pic, sorry for the blur). If I bypass it the fridge works and cools perfectly, so here is where I am:

- What caused it to blow? Many theories online including an obstructed vent or burner to just simply a fuse gone bad.

Any other ideas or causes that I can check?

- Read a few posts (not here) about this thermal fuse was part of a Dometic recall dealing with potential issues when running on propane.

Since I'm not running propane can I bypass this safely until I get a replacement fuse?

Thanks for your replies.


PS. Tried posting this question in the Gen Discussion- Appliances section however I'm told I have no rights to that section.

Attachment 134817Attachment 134818
Hi Frank, I have the problem, I dont find the parts , can you help me ?
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Old 06-15-2017, 11:04 AM   #11
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I had the same issue. Don't pay the money for the Dometic part. just search amazon for "152 Degree thermal fuse". They are extremely cheap and common.


Write up of my issue/solution here: http://www.forestriverforums.com/for...em-133396.html


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Old 06-15-2017, 12:00 PM   #12
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Ours went out while in Colorado last year - bypassed it to enjoy the week and half left of the trip. Ordered a pack of 10 off Amazon. Replaced it and have not looked back...
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Old 07-05-2017, 01:41 PM   #13
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152 degree, c of f?
All I see is c?
Thanks
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Old 07-05-2017, 03:15 PM   #14
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152 degree, c of f?
All I see is c?
Thanks
152 Celsius.

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Old 07-05-2017, 08:08 PM   #15
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Thought so but, still does not hurt to ask. Thanks
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Old 11-17-2017, 02:26 PM   #16
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Hello brand new 2017 Ultra V with the same fridge. first trip out this weekend. Having the same issue went 500 miles with the fridge on gas. Stopped mid trip the fridge was still on. Got to our destination and its completely dead no lights. I found the thermo fuse but how do you know if it went bad or not. Is there a way to check it.? Not real happy that I had to go buy a giant cooler and ice to keep all our food for 5 days cold.
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Old 11-17-2017, 04:21 PM   #17
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There is a thermocoupler screwed to the chimney with a small reset button. Lower down clamped to the back of the fridge is a thermofuse that does not reset. You need a multimeter to check for continuity on both of them. Trace the wire and disconnect one or both ends to run the meter.
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Old 11-17-2017, 04:24 PM   #18
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Quote:
Originally Posted by Hammerhounds View Post
Hello brand new 2017 Ultra V with the same fridge. first trip out this weekend. Having the same issue went 500 miles with the fridge on gas. Stopped mid trip the fridge was still on. Got to our destination and its completely dead no lights. I found the thermo fuse but how do you know if it went bad or not. Is there a way to check it.? Not real happy that I had to go buy a giant cooler and ice to keep all our food for 5 days cold.

No lights is probably something else. The blown thermofuse will light up with a trouble code on the display.

Check that you have power going to the unit, both 110vac and the 12vdc.

Tim
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Old 11-17-2017, 04:25 PM   #19
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When my thermofuse blew it cut ALL power to include the interior light.
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Old 11-17-2017, 05:16 PM   #20
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Keystoner is referring to a bi-metallic disc which, when it "pops", will interrupt the circuit and is "resettable", just like the red button on your residential water-heater. It's not a thermocouple. I like these when used for a flue over-temp protector. The thermofuses are one-shot deals used to protect the outside fridge compartment from an over-temp. Just goes to show ya, 60 plus years of learning how to protect us from when our appliances run amok.
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