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Skipg

Yuma

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Posted: 05/12/21 06:58am Link  |  Quote  |  Print  |  Notify Moderator

We have a Domeftic refrigerator with a thermistor to regulate temp. The thermistor is in the highest position on the cooling fin ,but I can only maintain 40-44 degrees. Outside temp is 90 degrees and rv is under cover. Is this temp normal? Anything I can do to get temp lower? Also have two small air circulation fans in the refrigerator.thanks for any feed back.

Old-Biscuit

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Posted: 05/12/21 08:17am Link  |  Quote  |  Print  |  Notify Moderator

1st off.....Model of that Dometic would be helpful

Moving thermistor.....that suggests you do not have 'adjustable temp settings" but an 'auto temp control' model

Unplug thermistor leads from lower circuit board (usually on upper left area of board....2 leads)
Run fridge for 12 hrs w/o thermistor...no temp sensing feedback to thermostat so fridge will cooling continuously.
Food compartment should get very cold provided circuit board is functioning properly and cooling unit is capable of full cooling


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johnhicks

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Posted: 05/12/21 08:43am Link  |  Quote  |  Print  |  Notify Moderator

In central Florida I'm seeing about 35F in the wee hours of the night and 45F in the afternoon. It's been working that way in summer for the past eight years.


-jbh-

jkwilson

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Posted: 05/12/21 09:05am Link  |  Quote  |  Print  |  Notify Moderator

Check the ventilating fan behind the refrigerator. Add more fans as needed.

Check the insulation at the top and sides of the refrigerator. Add insulation as needed and tape to keep outdoor air away from the refrigerator cabinet.


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Lwiddis

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Posted: 05/12/21 09:14am Link  |  Quote  |  Print  |  Notify Moderator

40 to 44 degrees in the fresh food compartment with outside temps in the 90s sounds pretty good to me.


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Cummins12V98

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Posted: 05/12/21 09:16am Link  |  Quote  |  Print  |  Notify Moderator

I am betting it's located in a slide?


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dougrainer

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Posted: 05/12/21 09:54am Link  |  Quote  |  Print  |  Notify Moderator

Model helps but a simple response----Do you have a Tstat adjustment on the eyebrow ON/OFF panel? It will be 1-5. If NOT, you have an Auto temp refer model. Doug

ernie1

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Posted: 05/12/21 10:43am Link  |  Quote  |  Print  |  Notify Moderator

40 degrees Fahrenheit is the absolute maximum temperature that potentially hazardous foods can be kept at. Anything above that and you are asking for trouble. Additionally, the longer time that the food is kept at that temperature, the more hazardous the food becomes. 35degrees F. or so is more ideal.
skipg: My Dometic RML8555, brand new has never done any better than yours and its sad that we consumers are saddled with these lousy appliances. As a side note: my two friends who bought new rvs that have the same fridge as I do, had the same problem also and Dometic's response is that that's the way they are. One friend spent $$$$ and switched to a 12volt compressor fridge and the other spent $$$ trying to repair something that couldn't be fixed. Myself, I've given up.

* This post was edited 05/12/21 10:52am by ernie1 *

Old-Biscuit

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Posted: 05/12/21 12:57pm Link  |  Quote  |  Print  |  Notify Moderator

ernie1 wrote:

40 degrees Fahrenheit is the absolute maximum temperature that potentially hazardous foods can be kept at. Anything above that and you are asking for trouble. Additionally, the longer time that the food is kept at that temperature, the more hazardous the food becomes. 35degrees F. or so is more ideal.
skipg: My Dometic RML8555, brand new has never done any better than yours and its sad that we consumers are saddled with these lousy appliances. As a side note: my two friends who bought new rvs that have the same fridge as I do, had the same problem also and Dometic's response is that that's the way they are. One friend spent $$$$ and switched to a 12volt compressor fridge and the other spent $$$ trying to repair something that couldn't be fixed. Myself, I've given up.


RV MFG are to blame for NOT properly installing Absorption fridges as per Norcold & Dometic Installation guides
Proper clearances, insulation, airflow/draft requirements etc

Those issues are with the RV MFG


YES....
The safe refrigerator temperature range in the main compartment is 40 degrees Fahrenheit or below, with 37 degrees Fahrenheit being considered the optimal for holding foods cold.

Those temps ARE achievable with absorption fridges ,,,when correctly installed
Airflow/Draft and clearances are critical

ernie1

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Posted: 05/12/21 01:35pm Link  |  Quote  |  Print  |  Notify Moderator

Old Biscuit: I agree with your statement concerning proper installation is necessary by rv manufacturers to achieve proper cooling. However, I have checked very carefully the installation requirements and clearances according to my owner's installation instruction and have found them to be spot on. I think I recall that Dometic's specs are set at a maximum of 95degrees F ambient which is the temperature at which my refrigerator can not keep up and the internal temps start rising into and above 40 degrees F. By the way, 37 degrees F is not a bad internal temperature for a refrigerator but not at all optimal because something of a lower temperature without freezing the food will give you more lee way in case ambient temps rise. Higher temps allow the bacteria to multiply faster. I think 35 degrees F is better because it won't freeze the food, gives more leeway in case of a rise in ambient and accounts for inaccuracy of thermometers. For what it's worth, my Dometic and those of my two friends who bought their rvs new, have better results with their refridges running on 120ac than they do on propane gas which is odd. This is after careful inspection and some repair by rv shops with careful guidance from Dometic. The results are 40+ degrees F in the 90+ degrees ambient. Totally unacceptable!

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