Troubleshooting Guide for Norcold, Dometic & Furrion RV Refrigerators
A warm RV refrigerator is one of the most common problems RVers run into, and it rarely means the whole fridge is finished. Most of the time the cause is a setup issue or one replaceable part. Work through the steps below in order, starting with the free checks, before you buy anything.
Before you start: write down the model and serial number from the label inside the fresh food compartment. You'll need both to find the right part, and they're the first thing we ask for if you call us.
How RV Refrigerators Work
Most RV refrigerators are absorption refrigerators. Instead of a compressor, they use heat from a propane flame or an electric heating element to circulate an ammonia, water and hydrogen solution through a sealed cooling unit on the back of the fridge. As that solution moves through the system, it pulls heat out of the refrigerator and releases it through the fins at the back.
Because the system relies on heat and gravity rather than a pump, three things matter more than anything else: the RV has to be reasonably level, the back of the fridge has to vent heat well, and the heat source (flame or element) has to be working. Nearly every cooling problem traces back to one of those or to the controls that run them.
Newer 12V compressor models, such as the Norcold N8DC/N10DC and Furrion Arctic, work like a home fridge and don't need leveling, but airflow, thermistors and control boards still apply.
7 Steps to Fix an RV Refrigerator That Isn't Cooling
Step 1: Make Sure Your RV Is Level
An absorption fridge that runs off-level for long periods can stop circulating and lose cooling. Most manufacturers want the RV within about 3 degrees side to side and 6 degrees front to back while the fridge is running (check your owner's manual for your model). If the fridge cooled before and stopped after a few days parked on a slope, level the RV, turn the fridge off for a few hours, then restart it.
Also give it time. An absorption fridge can take 4 to 8 hours to reach temperature from a warm start, longer in hot weather, so start it the night before a trip with nothing inside.
Step 2: Check Airflow Behind the Refrigerator
Your fridge has to dump heat out the back. Open the outside access panel and look for blocked roof or side vents, bird or wasp nests, leaves, and insulation or cardboard left in the vent space. If your fridge has a cooling fan on the back fins, make sure it spins when the fridge is working hard. Poor ventilation is the top cause of poor cooling in hot weather, when the outside temperature climbs above about 90°F.
Replacement fans: Norcold fans · Dometic cooling unit fans
Step 3: Check the Thermistor
The thermistor is the temperature sensor clipped to the fins inside the fresh food compartment. It tells the control board when to cool and when to stop. A failed or loose thermistor can cause no cooling, freezing everything, or erratic cycling. First make sure it's clipped firmly to the fins. Then test it with a multimeter and compare the reading to the spec for your model.
How to test it: Quickly test your Norcold thermistor
Replacements: Norcold thermistors · Dometic thermistors
Step 4: Check the Control Board
The power board (on the back of the fridge) and the eyebrow or optical board (on the front) decide which heat source to use and when to run it. A failed board can leave the fridge with lights on but no heat, show a fault code, or refuse to switch between AC and propane. Before replacing a board, confirm you have steady 12V DC power at the board, check its fuses, and look for burnt connectors.
Seeing a code? Norcold error codes explained
Replacements: Norcold power boards · Norcold board kits · Dometic circuit boards
Step 5: Check the Heating Element (Electric Mode)
If the fridge cools on propane but not on electric, the AC heating element is the most likely cause. With power off, unplug the element and measure its resistance with a multimeter. A reading of open (no continuity) means the element has failed. A good element reads roughly volts squared divided by watts; for a 120V 325W element that's about 44 ohms. Also check the AC fuse on the power board.
More help: RV refrigerator not working on electric
Replacements: Norcold AC heaters · Dometic heating elements
Step 6: Check the Propane Burner Assembly
If the fridge cools on electric but not on propane, look at the burner. A dirty burner tube or partly blocked orifice (jet) gives a weak, yellow flame that won't heat the cooling unit properly. Other causes are a worn igniter or electrode, a faulty gas valve, or low LP pressure. A healthy flame is steady and blue. Clean the burner and flue, and have gas valve problems checked by a qualified technician.
More help: RV refrigerator not working on propane but works on AC
Replacements: Norcold burners & orifices · Norcold gas valves · Dometic burners
Step 7: Check the Cooling Unit
If the fridge won't cool on any power source even though the heat source is working, the sealed cooling unit may have failed. Warning signs include an ammonia smell, yellow or green powdery residue on the back of the unit, and a boiler section that gets very hot while the fins stay at room temperature. A failed cooling unit can't be repaired; it has to be replaced. Turn the fridge off if you smell ammonia.
More help: RV refrigerator smells like ammonia · What causes cooling unit failures
Replacements: Norcold cooling units · Dometic cooling units
The Most Common RV Refrigerator Parts That Fail
- Thermistors: cause no cooling or freezing; inexpensive and easy to replace.
- Control and power boards: cause no heat, fault codes, or failure to switch modes.
- Heating elements: cause no cooling on electric only.
- Cooling fans: cause poor cooling in hot weather.
- Door seals, bins and shelves: a leaking door seal lets warm air in and causes frost.
- Cooling units: cause no cooling on any power source.
How to Find the Correct Replacement Part
Find the model and serial number on the label inside the fresh food compartment. Then shop by model so you only see parts that fit, or use our free interactive parts diagrams to match the exact part number. Some parts change at a serial number break, so the serial number matters.
Shop Parts by Model NumberView Parts Diagrams
Shop RV Refrigerator Parts
Norcold refrigerators & parts · Dometic refrigerators & parts · Furrion refrigerators & parts
Still stuck? Email info@rvfridgeguys.com with your model and serial number, or see our tech support options.