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.

Absorption vs compressor vs residential: what's in your rig?

Understanding your fridge type narrows the diagnosis fast. There are three main categories:

2-way absorption (propane + 120V AC) is found in most travel trailers and fifth wheels. These are the Dometic and Norcold units that need to be level and take hours to cool. If your fridge runs on propane, you have one of these.

3-way absorption (propane + 120V AC + 12V DC) appears in some older European and import campervans. They can technically run on battery power, but 12V mode is very slow and drains batteries quickly. It is a holdover from the caravan market.

12V compressor fridges (Dometic CRX/DMC, Furrion, Vitrifrigo) work like a miniature home fridge. They don't need leveling, cool faster, and are more energy efficient. Increasingly common in rigs built after 2020. If your fridge has no propane connection, it is a compressor model.

Residential fridges appear in some high-end fifth wheels and Class A coaches. They need constant 120V power (shore, generator, or a large inverter with a big battery bank). If yours stops cooling, the diagnosis is the same as a home fridge: check power, coils, and thermostat.

Norcold recall awareness

Several Norcold models (especially the 1200, N611, N621, and N641 series) have been subject to safety recalls for fire hazards related to the cooling unit. If you have a Norcold fridge that's not cooling, check whether your model and serial number are on the recall list at norcold.com or by calling Norcold at 1-800-767-9101. A recalled unit may be eligible for a free replacement or repair.

Signs of a dangerous cooling unit failure include yellow or rust-colored residue at the back of the fridge, a persistent ammonia smell, or visible warping of the metal cooling unit housing. If you see any of these, shut the fridge off immediately and do not attempt to restart it.

When 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. See our guide on running your RV fridge on 12V while driving for more detail.

How do I know if my RV fridge cooling unit is bad?

Three signs point to a dead cooling unit. First, a strong ammonia smell near the fridge or at the rear access vent. Second, yellow or rust-colored residue on the back of the unit. Third, the fridge has been level, powered, and running for 24+ hours and is still warm. If the tubes on the back of the cooling unit feel cold in some spots and hot in others (instead of uniformly warm), ammonia circulation has stopped. There is no field repair for a failed cooling unit. Replacement runs $800 to $1,500 for the part, plus labor.

Can I run my RV fridge on battery only?

Compressor fridges (12V models) run on battery and draw roughly 3 to 5 amps. With a 200Ah lithium battery bank, you can run a compressor fridge for about 24 to 40 hours without solar or shore power. Absorption fridges technically have a 12V element in some 3-way models, but it draws 8 to 15 amps and is only meant as a short-term bridge, not a primary power source. For extended boondocking on battery, a compressor fridge is the better setup. Make sure your converter and battery are healthy.

How long should an RV fridge last?

Absorption fridges typically last 15 to 20 years if maintained properly. That means keeping them level, keeping the flue clean, and ensuring good ventilation. Compressor fridges have a similar lifespan. The cooling unit is the most expensive part to replace on an absorption fridge. If your rig is over 15 years old and the fridge has never had the cooling unit replaced, a failure is not unusual.