I have a Dometic RM1350 Refer; when turning on the unit works great whether gas or elec. on setting 4 refer runs about 35 deg. freezer is 0 deg. then around 4 pm it warms to around 40 deg. then by 3 am its back to 35 deg. again. After about a 7 to 14 days at 4 pm it warms to 45 - 50 deg. but then only cools to maybe 40 deg. regardless of exterior temp. this is not the 1st time it's done this, any ideas? Cooling fans are running, changing temp setting makes no difference, refer side is facing East, so no afternoon sunI get the feeling it goes into defrost mode and doesn't come out of it completely.

The hottest part of the day it can not keep up with the external heat. Is the refrigerator on the sunny side of the the trailer? Could use some shade if it is.

Supposed to be 96F in Hemet today. If your fridge stays in the 40s I think that’s pretty good.

A refrigerator that chases the outside temperature is improperly vented or has a weak cooling unit.Vented refers to the airflow/draft across backside of fridge cooling unitTo test cooling unit....Unplug thermistor leads from lower circuit boardPlug a new thermistor in and hang it out the lower vent coverRun fridge on AC for at least 12 hrs to see if cooling unit can cool....(thermostor hanging outside causes fridge to run continuously)Place gallon jug of water in food compartment...if after 12 hrs temp is NOT below 43*F then cooling unit is faultyCouple other things to check first.......Door seals leaking (dollar bill test)Food compartment drip tray drain tube......cracked or plug missing from end of tube---Either will allow warm air to be pulled into food compartmentService Manual

They make a fan that attaches in the back of the fridge that comes on when the outside temp reaches N degrees and help remove hot air from behind the unit.There is one on mine. They also make a battery powered fan that you can place inside the fridge to better circulate the cooling.

wildtoad wrote:They make a fan that attaches in the back of the fridge that comes on when the outside temp reaches N degrees and help remove hot air from behind the unit.There is one on mine. They also make a battery powered fan that you can place inside the fridge to better circulate the cooling.OPs fridge comes with TWO external fans....but thermostat is highCloses at 149*F and opens at 122*F (+/- 9*F)That means condenser gets hotter before fans kick on so more heat to removeThermostat/fans DC Power comes from DC Terminal Block to Relay with in-line fuse from Relay to thermostat and fans (Red Wire)If door seals are good, drain line good and cooling unit can cool I would change out the thermostat on the far right condenser fin with one that has lower close/open tempo settings so fans come on earlier

Dometic Refrigerator cooling | Good Sam Community

Old-Biscuit
Explorer III
May 27, 2020
A refrigerator that chases the outside temperature is improperly vented or has a weak cooling unit.

Vented refers to the airflow/draft across backside of fridge cooling unit

To test cooling unit....
Unplug thermistor leads from lower circuit board
Plug a new thermistor in and hang it out the lower vent cover
Run fridge on AC for at least 12 hrs to see if cooling unit can cool....(thermostor hanging outside causes fridge to run continuously)
Place gallon jug of water in food compartment...if after 12 hrs temp is NOT below 43*F then cooling unit is faulty

Couple other things to check first.......
Door seals leaking (dollar bill test)
Food compartment drip tray drain tube......cracked or plug missing from end of tube---
Either will allow warm air to be pulled into food compartment

Service Manual
Lwiddis
Explorer II
May 27, 2020
Supposed to be 96F in Hemet today. If your fridge stays in the 40s I think that’s pretty good.
agwill
Explorer
May 27, 2020
The hottest part of the day it can not keep up with the external heat. Is the refrigerator on the sunny side of the the trailer? Could use some shade if it is.

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Dometic Refrigerator cooling

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