RV fridge not cooling? Start here.
Most RV fridges are absorption units, and they behave nothing like your fridge at home. The fix is usually boring.
Before you panic about a $1,500 cooling unit replacement, know this: most "broken" RV fridges aren't broken. They're just not level, not ventilated, or not running on the power source you think they are. Work through these in order.
1. Is the rig level?
This is the absorption fridge killer. These fridges use gravity to circulate ammonia through cooling coils. If the rig is tilted more than about 3 degrees for an extended period while the fridge is running, the ammonia stops circulating and the cooling unit can actually be permanently damaged.
If you've been parked unlevel for a while and the fridge isn't cold, shut it off, level the rig, wait an hour, and turn it back on. Give it 4 to 6 hours to cool down.
2. Did you give it enough time?
RV absorption fridges are slow. They take 4 to 8 hours to get fully cold from a warm start, and up to 24 hours if the rig has been sitting in the sun. Don't load a warm fridge with warm groceries and expect cold drinks in an hour.
Pre-cool the fridge overnight at home before a trip if you can, or run it the morning before you leave.
3. Which power source is it on?
Absorption fridges can run on propane OR 120V electric. Many have an "Auto" mode that switches between them. Check the control panel:
- On electric only? Make sure you're actually plugged into working shore power. Check the outlet with something else.
- On gas only? Confirm your propane tank has gas and is turned on. Light a stove burner to verify gas flow.
- On auto? The fridge may be stuck trying to light gas or waiting for AC. Try forcing it to propane only.
4. On propane: is the burner actually lighting?
Go outside and open the fridge's rear access panel (the vented cover on the side of the rig). Have someone inside turn the fridge on in gas mode. Listen and look for the burner lighting. You should hear a small "whoosh" and see a blue flame.
If it tries to light and fails multiple times, the igniter or thermocouple is dirty. A can of compressed air can clear spider webs from the flue, which is the most common cause of ignition failure. Seriously, mud daubers and spiders love RV fridge flues.
5. Ventilation check
The rear access panel has upper and lower vents. Cooling depends on hot air rising out through these vents. If the upper vent is blocked by leaves, a bird nest, or aftermarket insulation, the fridge can't shed heat and will never get cold.
Clear any obstructions. In extreme heat, some owners add a small 12V fan to the back of the fridge to force airflow, this can drop internal temps by 10 to 15 degrees.
6. 12V fuse check (for compressor fridges)
If you have a 12V compressor fridge, it still needs 12V power even when plugged into shore power. Check the 12V fuse panel for a blown "REFR" or "FRIDGE" fuse.
7. The ammonia smell test (absorption only)
If you smell a strong ammonia or sulfur smell near the fridge or at the rear vent, STOP. Your cooling unit has failed and is leaking ammonia. This is toxic. Shut the fridge off, ventilate the rig, and call a tech. The cooling unit itself needs to be replaced.
Still warm after 6 hours?
Open Camphost and describe what's happening with your fridge. It'll walk you through the diagnosis for your exact model and help find a tech if it's a cooling unit failure.
Open CamphostWhen to call a mobile RV tech
- You smell ammonia near the fridge
- You see yellow residue or liquid at the rear of the cooling unit
- The burner won't light at all after cleaning the flue
- Fridge has been perfectly level and powered for 24 hours and is still warm
- The freezer works but the fridge section is warm (or vice versa)
Frequently asked questions
Why is my RV absorption fridge not cooling on propane but works on electric?
If it cools on AC but not LP, the issue is on the propane side: a clogged burner orifice, no LP supply, or a failed igniter. Make sure your propane tank is open, other propane appliances (stove, water heater) work, and listen for the burner clicking when you switch to LP mode.
How long does it take an RV fridge to get cold?
Absorption fridges (Dometic, Norcold) take 6 to 24 hours to fully cool down from warm. Compressor fridges are faster, usually 2 to 6 hours. Always pre-cool overnight before a trip and pre-load with already-cold food. Trying to cool warm food and warm air at once is the #1 reason people think their fridge is broken.
Does an RV fridge need to be level to work?
Absorption fridges yes, compressor fridges no. Absorption fridges use ammonia gravity flow and stop working if you're more than about 3 degrees off level (front-back or side-side). Compressor fridges (12V or residential) work at any angle. If you can stand comfortably in your rig, your absorption fridge is level enough.
What does a yellow ammonia stain on the back of my RV fridge mean?
A yellow or rust-colored stain near the cooling unit, plus a strong ammonia smell, means the cooling unit has leaked and is dead. There is no field repair. You need to replace the cooling unit (~$1,200) or the entire fridge. Don't keep running it, the ammonia is harmful in enclosed spaces.
Can I run my RV fridge while driving?
Yes, on 12V (compressor models) or propane (absorption models). Most modern absorption fridges have an Auto mode that picks the best power source. Some campgrounds, ferries, and tunnels prohibit propane while moving, so check local rules. Compressor fridges are simpler: they just run off the house battery.