Dometic fridge not cooling

oldpastonian replied on 16/07/2019 12:26

Posted on 16/07/2019 12:26

I have a Dometic RMD 8551 fridge (with separate freezer) in my 5 year old Sterling. I can see there have been other posts about apparent issues with this model not cooling to food safe temperatures. In my case I don't think its worked properly from new and in ambient temperatures of 25 degrees C to 30 degrees C the fridge barely manages 10 degrees C, (and not much below that at all in cooler UK temperatures) although bizarrely the freezer easily maintains well below freezing and quickly freezes ice cubes.

I've always followed the standard advice (level, shaded from sun, limit door opening etc) and removed the ventilation vents and have just now fitted additional ventilation fans, none of which makes any difference. As far as i can tell it has been installed in accordance with Dometic instructions.Using gas makes no difference.

It's not safe to store perishable food at 10 degrees C plus and it's fortunate I have a compressor driven portable fridge I can use as well while here in Brittany on holiday.

I raised the issue with Dometic back in 2016, but they more or less dismissed the problems siting the same advice as I've mentioned earlier. They also said the normal operating temperature for the fridge is 7 degrees C, which to my mind makes it not fit for purpose anyway as I understand perishable foods need about 4-5 degrees C for safety.

Previous fridges used in the same pitch have always worked satisfactorily even freezing in the fridge compartment sometimes in higher ambient temperatures so I'm pretty much convinced there is potentially a design flaw (or manufacturing fault) with this model given the various forum discussions about it (and as I've experienced the issues since new).

Perhaps there is a blockage or narrow cooling tube and maybe related to a design or manufacturing flaw.

Is this issue familiar to any one else and if so any solutions please?

seapea replied on 03/07/2023 15:37

Posted on 03/07/2023 15:37

I concur with the original post. This seems to be an on going problem with Dometic. I have a 2021 Coachman with a Dometic fridge. In ambients above around 25 deg C, the fridge does not cool below an unsafe 10 deg C. and has not done since new. I have fitted the expensive Dometic fan but have seen little improvement.

Has anyone resolved this problem? Has anyone challenged this under warranty ie not fit for purpose?

jennyc replied on 28/07/2023 16:10

Posted on 28/07/2023 16:10

Following this year’s 30+ Deg temperatures in southern Europe, I’ve once again looked at Dometic fridge problems. We’ve removed the insect screens, fitted fans and parked in the shade. Our best advice came from Dometic themselves, who tell me that the fridge will cool to 16 deg below ambient temperature and not further. So at 36Deg ambient, we’re getting 20Deg, confirmed by me.

if you feel that Dometic and Swift in my case have been mis sold our refrigerators, then I agree, and I’d swap it out for an alternative if I could, but like others, I’m stuck with it. Out of interest, our ice box froze into a ball of ice, which with its reduced surface area, no longer worked either.

All in all, Dometic are selling goods which aren’t fit for purpose and Swift et all are fitting them. I note that Dometic have bought out Kampa, who’ve previously been market leaders. I predict a downturn to accompany the current price increases.

replied on 28/07/2023 16:53

Posted on 28/07/2023 16:53

The user and all related content has been Deleted User

jennyc replied on 28/07/2023 17:10

Posted on 28/07/2023 17:10

Thanks DD, thermal grease on fridges is a new one on me. Back when we built our own PCs, white thermal grease was applied between the CPU and its heat sink. I assume that you’re using it between the thermostat and cooling fins. Though Dometic’s advice that the fridge was only designed for a 16 deg drop stands, every little helps.

Yes, I agree,  Kampa we’re a pleasure to deal with.

replied on 28/07/2023 17:38

Posted on 28/07/2023 17:38

The user and all related content has been Deleted User

jennyc replied on 28/07/2023 22:15

Posted on 28/07/2023 22:15

Thanks again DD. we’re away right now, but it’ll get priority when we return. I haven’t looked yet, but I imagine that a Google search will spot a resource.

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