This guide is for 12V compressor RV fridges: Norcold N8DC, N10DC, N15DC and N20DC, Furrion Arctic and Everchill, Dometic DM, CRX and NRX 12V models, and InVision. If you have a propane (absorption) fridge, use our propane RV fridge not cooling guide instead.
Seeing a code on the display? Look it up in our Error Code Tool first.
Quick checks before you dig in
- Check your thermometer placement. The door shelves and the front of the fridge run warmer than the back. Put the thermometer in a glass of water on a middle shelf and read it after a few hours.
- Check the setting and mode. Many 12V fridges have an eco, low-power or night mode that holds the fridge warmer to save battery. Some Furrion owners report low-power mode holds the fridge around 43°F.
- Don't set the freezer colder than it needs to be. An extreme freezer setting can leave the fresh-food side short on cold air.
- Close the door firmly and check the seal. Close the door on a dollar bill in a few spots. If it slides out easily, the gasket isn't sealing.
1. Low voltage at the fridge
This is the most common cause of a 12V fridge that won't cool or keeps shutting off. A compressor fridge needs steady voltage at the fridge itself, not just at the battery. Norcold's installation manuals for the N8DC/N10DC and N15DC/N20DC give these figures:
- Operating range: 10.4 to 15.4 volts DC.
- The fridge shuts off below 10.4 volts and doesn't restart until the supply climbs back to 11.9 volts.
- The wiring should lose no more than 0.3 volts between the battery and the fridge.
Norcold's minimum wire sizes for the positive and negative runs (one cable each way):
| Cable length (one way) | Minimum wire size |
|---|---|
| Up to 15 ft | 10 AWG |
| Up to 20 to 25 ft | 8 AWG |
| Up to 40 to 45 ft | 6 AWG |
How to check it: with the compressor running, measure the voltage at the fridge's power leads, then at the battery. If the fridge reads more than about 0.3 volts lower, the wire is too small, a connection is loose or corroded, or the circuit is shared with other loads. Factory installs aren't immune: one RV maker issued a service bulletin to run a new 12-gauge supply wire after its 12V fridges were spliced into a circuit that couldn't carry enough current.
Also check the fuse. Norcold's 12V models have a 15 amp automotive fuse at the fridge's power supply leads. Only replace it with the same rating.
If your battery itself is running low, the fridge will cut out to protect it. Use our Solar Sizing tool to check that your battery bank and solar can keep up with your fridge.
2. Blocked ventilation or too much heat
A compressor fridge pushes heat out through its condenser, so it needs airflow. Norcold's manuals say the built-in top vent and bottom clearance must not be blocked. Blocked airflow causes poor cooling, a compressor that runs nonstop and fast battery drain.
- Keep stored items, rugs and trim away from the top vent and the bottom gap.
- Keep the fridge away from heat sources such as a furnace outlet.
- Expect weaker cooling in extreme heat. Norcold notes performance can drop above 110°F ambient and warns never to run the fridge above 140°F.
- If you replaced a propane fridge, follow the new fridge's instructions for the old roof and sidewall vents. Norcold's manuals call for blocking off exterior vents around its 12V models.
3. Freezer cold, fridge warm
Many 12V fridges cool the fresh-food side with air blown from the freezer. When that airflow stops, the freezer stays cold while the fridge warms up.
- Don't pack food against the back wall or over the air openings between the compartments.
- Look for ice on the back wall of the freezer or around the air openings. To clear it, turn the fridge off, prop the doors open and let it thaw fully.
- Listen for the air damper. Some models use a small motorized door to send cold air to the fridge side. If it sticks closed, the fridge side won't cool.
4. Fan not running
Most 12V fridges have an interior fan that circulates cold air, and a condenser fan that clears heat from the compressor area. If the compressor runs but a fan doesn't, cooling suffers. Listen for both with the compressor running. On some Furrion models, owners report a fan under the top cover that cools the control board.
5. Reset the control
Control boards can lock up after a voltage drop. Turn the fridge off and remove all 12V power for at least 30 minutes, by pulling the fuse or opening the breaker, then power it back up. Some Furrion owners report this clears a fridge stuck at around 42°F.
6. Compressor or control board failure
If the voltage at the fridge is good, the vents are clear, the fans run and a reset doesn't help, the control board or compressor may have failed. Many 12V RV fridges are still under warranty, so check yours before buying parts. We stock control boards, thermistors and other parts for many models: find yours in our Parts Diagrams, including the Norcold N8DC/N10DC and N15DC/N20DC diagrams.
Still not cooling?
If it's time to replace the fridge, our RV Fridge Finder shows every fridge that fits your opening. Or call us at 1-800-712-8822 and we'll help you track it down.