Dometic DMR702 Fridge - No Power

[frankm]

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 152°C 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. [emoji46]

[Handydc]

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.

[frankm]

Thanks handydc, already ordered the fuse. I was trying to get ahead with info in the event it blows right after I replace it.

[Herowe]

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.

[frankm]

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.

[Herowe]

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.

[frankm]

Amazon has a pack of 10 for $12, free shipping with Prime.

[frankm]

Also please let me know what dealer says as to what the cause was or may have been.

[Herowe]

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.

[Patrick1974]

Originally Posted by frankm

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 152°C 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. [emoji46]

Attachment 134817Attachment 134818

Hi Frank, I have the problem, I dont find the parts , can you help me ?

[Cowracer]

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


Tim

[Webhair]

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...

[Pillboxmc]

152 degree, c of f?
All I see is c?
Thanks

[Cowracer]

Originally Posted by Pillboxmc

152 degree, c of f?
All I see is c?
Thanks

152 Celsius.

Tim

[Pillboxmc]

Thought so but, still does not hurt to ask. Thanks

[Hammerhounds]

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 it’s 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.

[Keystoner]

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.

[Cowracer]

Originally Posted by Hammerhounds

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 it’s 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

[Keystoner]

When my thermofuse blew it cut ALL power to include the interior light.
Here are pictures that I was unable to attach to my initial reply

[Old Forester]

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.