Dometic RMD8555 Frustration - Page 8 - Escape Trailer Owners Community

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Old 05-12-2016, 11:00 PM   #71
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Take_a_hike,

Our local Dometic Warranty Center worked with Dometic troubleshooting the fridge after verifying the tests that we had conducted. I have to give them credit for getting the replacement.

Our unit proved that it could cool but it was loosing so much cold air out of the fridge that it just couldn't keep up. Temperatures would rise dramatically when traveling or when running the MaxxFan on exhaust. You could feel the cold air escaping when the MaxxFan was on exhaust. Hot air was being pumped inside the fridge from the rear. We used a candle to try to identify where the hot air was entering the fridge, pushing out the cold air. It would almost blow the candle out in multiple places behind the fins. Attempts to seal this area with butyl tape proved useless.

In the midst of the DWC working with Dometic, I believe a board also failed (and maybe some other oddities) and shortly thereafter a replacement fridge was on the way.

The replacement fridge is still SN rated but my understanding is that Dometic went to an improved cooling system and better insulation on the newer RMD8555 units. Not sure about that though. I still don't understand why we can't get the Tropical and SubTropical versions of this fridge in North America. We were so frustrated that would have been willing to pay a hefty price to get one of those versions installed.

Keep in mind that we haven't camped in any serious heat since we got the replacement RMD8555 and aren't sure how it will perform yet in those conditions. I guess we will find out in the next few months.

We don't have the experience that many other forum members have with RV fridges as much of our past camping has been in tents. With that said, we could use some education on how to properly pack the fridge! One thing we have done on the last two trips was to add a few frozen water bottles and an ice pack before we start our trip. Not sure if this is necessary or wise, but it works for us, at least thus far.

Mark
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Old 05-12-2016, 11:47 PM   #72
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... His contact at Dometic told him to disconnect the thermistor . So now we have a refrigerator with the thermistor disconnected. The refrigerator seems too cool better but this does not seem like a permanent fix. I emailed Dometic and asked if it was OK to have the thermistor disconnected. The reply from Dometic was he should not have disconnected it.
I think it's surprising that these refrigerators operate at all without a valid signal through the thermistor. It's not an on-off switch like a thermostat - it's a temperature-sensitive resistor. Disconnected, it reads like an infinitely high temperature (causing the refrigerator to run flat-out just like an always-on thermostat would), but a reasonable control board would flag that unreasonable reading as an error.
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Old 05-13-2016, 12:02 AM   #73
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I think it's surprising that these refrigerators operate at all without a valid signal through the thermistor. It's not an on-off switch like a thermostat - it's a temperature-sensitive resistor. Disconnected, it reads like an infinitely high temperature (causing the refrigerator to run flat-out just like an always-on thermostat would), but a reasonable control board would flag that unreasonable reading as an error.
Brian if we are saying disconnected on thermostat , are we saying removed from the plastic holder or really disconnected ? Pat
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Old 05-13-2016, 12:10 AM   #74
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Brian if we are saying disconnected on thermostat , are we saying removed from the plastic holder or really disconnected ? Pat
Really disconnected - meaning going into the back of the refrigerator (from the outside) and disconnecting wires.

Taking the thermistor out of its plastic holder doesn't matter. The holder slides so that the thermistor can be in different locations and thus see slightly different temperatures. This is Dometic's hack way to provide some adjustability to a fundamentally fixed-temperature design, at zero cost. The model in my motorhome has this sliding gadget; the more expensive version of the same series of refrigerators has an adjustment on the control panel.

The "thermistor adjuster" from Dinosaur is an aftermarket approach to adding in the feature that Dometic left out of these non-adjustable models.
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Old 05-13-2016, 01:37 AM   #75
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Really disconnected - meaning going into the back of the refrigerator (from the outside) and disconnecting wires.

Taking the thermistor out of its plastic holder doesn't matter. The holder slides so that the thermistor can be in different locations and thus see slightly different temperatures. This is Dometic's hack way to provide some adjustability to a fundamentally fixed-temperature design, at zero cost. The model in my motorhome has this sliding gadget; the more expensive version of the same series of refrigerators has an adjustment on the control panel.

The "thermistor adjuster" from Dinosaur is an aftermarket approach to adding in the feature that Dometic left out of these non-adjustable models.
Glad To know I am not contributing to ruining my Domectic frig . I have seen the sliding thermistor you are speaking about . I have something similar ,the snip the tip ,as the dinosaur . So far everything I did to frig is working a lot better so I never installed the , snip the tip . But I have it . The one item I have not so far got to try out , the fridge guard to keep cool air from leaving when I open the door at least maybe keep things from falling out when I open my door . Had me scared for a minute . Thankyou . Pat
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Old 05-13-2016, 12:20 PM   #76
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Mine seems to be working fine.
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Old 05-13-2016, 07:18 PM   #77
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Mine seems to be working fine.
So far frig is doing pretty good . I guess I am afraid to cut the wires truth be told . Did you just cut battery power or remove I forget something from back before you cut the wires ? Pat
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Old 05-13-2016, 07:29 PM   #78
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I say frig it.
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Old 05-13-2016, 08:25 PM   #79
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Myron-
I like your fix! If we weren't under warranty we would try it too!
I am beginning to wonder if we will get Dometic to repair it. I feel like the last repair man just wanted to get it off his lot because he was so busy with money jobs and didn't want to deal with a Dometic warranty repair. He acknowledged it was not getting cold enough and ran all the tests. He said did say Dometic was stingy about sending out replacement parts.
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Old 05-13-2016, 09:05 PM   #80
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What gbaggs said.
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