Norcold Refrigerator Error Codes Explained

Norcold Refrigerator Error Codes Explained

When a Norcold fridge finds a problem, it shuts down the affected mode and shows a code. The same fault can look completely different depending on your model: two letters on one fridge, a single letter on another, a flashing light on a third. Find your model below to see exactly what your code looks like, then follow its step-by-step flowchart.

Six Norcold displays, six different ways of showing a code. The lights and displays on this page blink the way they do on the fridge.

Safety first. Some codes, like LI oP, are fire-prevention shutdowns. Find out why a code appeared before you reset it. Turn off propane and 120V before working on the burner or wiring, and never use a flame to check for gas leaks.

STEP 1

Find your Norcold model

Each card shows what a code looks like on that fridge. Tap your model to see all of its codes.

Norcold 1200 / 12101200LR, 1201LR, 1200AC, 1210AC, 1211 and IM ice maker versions Two-part letter display. The code alternates, like no then FL. See 1200 / 1210 codes ↓ Norcold N6 / N8 seriesN610, N611, N621, N622, N623, N640, N641, N643, N810, N811, N821, N822, N823, N841, N842, N843 (2-way, 3-way, .3 and IM) Three panel types, depending on your model: two-part letters, a single letter, or ON and GAS lights. See N6 / N8 series codes ↓ Norcold N4000N4104, N4141, N4150 Code number next to a wrench on the LCD, or lit bars that spell the code in binary on the LED panel. See N4000 codes ↓ Norcold Polar N7 / N8 / N10N7V, N7X, N7LX, N8V, N8X, N8LX, N10 and the NA7, NA8 and NA10 versions A status light flashes red, green or amber. Count the flashes. “no dt” means the boards aren’t talking. See Polar codes ↓ Norcold N8DC / N10DCN8DC, N8DCX, N10DC, N10DCX (12V compressor) E1 to E4 in the MODE window, plus 1 to 6 flashes read with a test LED on the compressor power module. See N8DC / N10DC codes ↓ Norcold N15DC / N20DCN15DC, N15DCSS, N15DCIMSS, N20DC, N20DCSS (12V compressor) E1 to E9 blink in the MODE display. Some units blink the blue ON light instead. See N15DC / N20DC codes ↓

NORCOLD 1200 / 1210

1200 / 1210 error codes

1200LR, 1201LR, 1200AC, 1210AC, 1211 and IM ice maker models

Blank displayWon’t turn on. 12V, F1 fuse, board, harness or display.Flowchart → Flashing temp settingYour temperature setting blinks. Thermistor open or shorted.Flowchart → AC HEBoth AC heaters open or not connected.Flowchart → AC rEAC heater relay on the board stuck closed.Flowchart → no ACUnder 85 volts AC at the board. Outlet, cord or F2 fuse.Flowchart → dc LO12V DC under 10.5 volts.Flowchart → dc HI12V DC over 15.4 volts.Flowchart → no FLBurner didn’t light in the 30-second try.Flowchart → FL --Flame sensed with the gas off. Gas valve or board.Flowchart → SrFlame sensing circuit fault on the board.Flowchart → L1 oPHigh-temperature limit switch open. Boiler overheated.Flowchart → drDoor sensed open over 2 minutes.Flowchart →

NORCOLD N6 / N8 SERIES

N6 / N8 series error codes

2-way, 3-way, .3 (3-way) and IM (ice maker) versions

Blank displayWon’t turn on. 12V supply, F1 fuse, power board or display board.Flowchart → no FLBurner didn’t light or relight on propane.Flowchart → SrFlame sensing circuit on the power board failed.Flowchart → dc LO12V DC under 10.5 volts, or converter ripple.Flowchart → dc HI12V DC over 15.4 volts.Flowchart → dc rE3-way only. DC heater relay stuck closed.Flowchart → dc HE3-way only. F2 fuse, DC heater or board.Flowchart → no ACNo 120V AC at the board. Supply, cord, F3 fuse or clips.Flowchart → AC rEAC heater relay on the board stuck closed.Flowchart → AC LOAC under 108 volts. Usually the power source.Flowchart → AC HIAC over 132 volts. Usually the power source.Flowchart → AC HEAC heater open: connectors, heater (38–53 Ω) or board.Flowchart → drDoor read open over 2 minutes. Striker, door swing or lamp switch.Flowchart → Flashing temp settingThermistor fault. Fridge runs on its backup timer.Flowchart → no coNo cooling seen during a full cycle. Venting, level, then cooling unit.Flowchart →

NORCOLD N4000

N4000 error codes

N4104, N4141, N4150

Display won’t turn onBlack display. No 12V, or a short outside the fridge.Flowchart → Code 1: Flame sensed with gas offGas valve not closing, or the board.Flowchart → Code 2: Burner control moduleWrong feedback from the burner control. Power board.Flowchart → Code 3: Gas lockoutNo flame in 30 seconds. Gas, spark, burner, pressure.Flowchart → Code 4: DC heater not workingOff when it should be on. Fuse, heater or board.Flowchart → Code 5: DC heater stuck onOn when it should be off. Relay on the board.Flowchart → Code 6: 12V out of rangeBelow 10 V or above 15 V. Supply, fuse or solar.Flowchart → Code 7: No engine signal (D+)Manual DC mode with no engine-running signal.Flowchart → Code 8: AC heater failureHeater current far too low. Heater, fuse or board.Flowchart → Code 9: AC heater stuck onOn when it should be off. Relay on the board.Flowchart → Code 10: AC out of rangeOutside 108 to 132 volts. Usually the source.Flowchart → Code 11: No energy source in AUTONo AC, DC or gas available to run on.Flowchart → Code 12: Boards not communicatingLow 12V, resettable fuse, plugs, cable or a board.Flowchart → Code 13: Thermistor failureSensor not read. Runs on its backup timer.Flowchart → Not cooling well, no codeWeak on 12V, AC or propane. Thermistor first.Flowchart →

POLAR N7 / N8 / N10

Polar status light flash codes

Count the flashes and note the color

Light	Code	Meaning
	Solid red	Didn’t start on the selected energy source.
	Red, 1 flash	AC heater fault.
	Red, 2 flashes	Control fault: gas solenoid or board.
	Red, 4 flashes	AC heater stuck on.
	Red, 5 flashes	Flame sensed when LP shouldn’t be lit.
	Red, 8 flashes	12V DC supply low.
	Red, 9 flashes	120V AC supply high.
	Red, 10 flashes	Front and rear boards lost communication.
	Green, 1 flash	Running on AC in limp mode.
	Amber, 1 flash	Running on LP in limp mode.

NORCOLD N8DC / N10DC

N8DC / N10DC error codes

N8DC, N8DCX, N10DC, N10DCX 12V compressor fridges

E1: Fresh food thermistorThe lower compartment’s sensor isn’t cycling. Plug, sensor, wiring.Flowchart → E2: Freezer thermistorThe freezer’s sensor isn’t cycling. Plug, sensor, wiring.Flowchart → E3: Voltage out of rangeBelow the 10.4 V cut-out. Battery, wire size, then the board.Flowchart → E4: Door left openFresh food door open over 2 minutes. Door, plugs, board.Flowchart → 1 flash: Battery protection cut-outVoltage outside 9.8 to 17.0 V at the module. Fuse, battery, wiring.Flowchart → 2 flashes: Fan over-currentOver 1 amp on terminal F, which should be empty. Wiring or module.Flowchart → 3 flashes: Compressor won’t startRotor stuck or pressure too high. Often just restarted too soon.Flowchart → 4 flashes: Speed too lowCan’t hold 1,850 rpm. Heat, airflow, fan, low voltage.Flowchart → 5 flashes: Module overheatingBoard over 203°F. Vents, condenser coil, fan.Flowchart → 6 flashes: Module hardware failureReplace the module. No flashes? Check wire size and the board.Flowchart → Not cooling, compressor won’t turn onPower, fuse, thermistors, harness, module, compressor windings.Flowchart → Compressor runs but won’t coolSettings, airflow, condenser, fan, wiring, board.Flowchart → Gets too cold or freezing foodThermistors, diverter valve, the T signal to the module.Flowchart → Building frost insideDoor seal, cold settings, humidity, door openings.Flowchart → Won’t run on 12V DCFuses, wire size, battery voltage, wiring, board, module.Flowchart →

NORCOLD N15DC / N20DC

N15DC / N20DC error codes

N15DC, N15DCSS, N15DCIMSS, N20DC and N20DCSS 12V compressor fridges

When something goes wrong, the code blinks in the MODE display, where the temperature setting (1 to 5) normally shows. The blue light above the ON/OFF button glows solid when the fridge is running normally.

Good to know

• Voltage: starts at 10.9 V, shuts off at 10.4 V, restarts at 11.7 V.
• Blue light off and won’t run? Check the two fuses under the fridge (freezer and fresh food).
• Overheat protection: the power module shuts off at 212°F and restarts below 176°F. Keep the area behind the fridge clear.
• After turning it off, the compressor waits 5 minutes before restarting.
• Limits: within 10° of level; cooling suffers above 110°F inside the RV.

OLDER MODELS & CLASSIC CODES

N1095, 2117, 2118, N410 / N510, N611 / N811

The classic Norcold codes, side by side on every display type

Problem	Two-part display 1200, 1210, N640, N641, N643, N841, N842, N843	One letter N621, N622, N623, N821, N822, N823	LED lights N610, N611, N810, N811	Flash count
No cooling detected				5 flashes (N610, N611, N810, N811, N410, N510)
High-temperature limit				6 flashes
AC heater fault				ON light flashes 3 times
No flame on propane				GAS light flashes once a second
Flame sense failure			—	—
Controls failure	—	—		4 flashes (N611/N811)

CLASSIC CODES

What each classic code means and how to fix it

These codes show up across many older Norcold models

What it means

The control didn’t see the fridge get colder over a full cooling cycle, so it locked out that mode to protect the system.

Common causes

• The RV isn’t level
• Blocked roof or side vents, or a dead vent fan
• A failing thermistor (temperature sensor)
• Low propane pressure
• A failing cooling unit

How to fix it

Level the RV, clear the vents, and check the thermistor. Then reset the board (see our lockout reset guide). If the code keeps coming back, look for the signs of cooling unit failure.

Related: Norcold thermistors · Norcold fans · Norcold cooling units

What it means

The high-temperature limit switch on the cooling unit opened, or the wiring to the board’s LIMIT terminals is broken. This is a fire-prevention shutdown.

Common causes

• The cooling unit boiler overheated, often an early sign of a failing cooling unit
• A loose or broken wire at the limit switch or its board terminals
• A failed limit switch

How to fix it

Don’t just reset it. Find out why it tripped first. Check the wiring and the switch, and inspect the cooling unit for leaks or yellow residue.

Related: LI oP, o or 6 flashes: potential fire hazard · Protect your Norcold with a thermal safety switch · High-temperature limit switches · 637360 (1210, 2118) · 2M0802 (N6, N8, N1095)

What it means

In 120V AC mode, the control isn’t seeing the AC heater draw current.

Common causes

• A loose or burnt heater connector
• A blown fuse on the power board
• A failed (open) AC heater
• A failed relay on the power board

How to fix it

Check the heater wiring and the board fuse, then measure the heater’s resistance. If the heater is out of spec, replace it. If it’s good, suspect the power board.

Related: Are your Norcold AC heaters hooked up properly? · Norcold AC heaters · Norcold power boards

What it means

On LP gas, the burner didn’t light, or it lit and went out, and the control couldn’t sense a flame.

Common causes

• An empty tank or a closed valve
• A dirty burner or orifice
• An electrode out of position or cracked
• Low gas pressure
• A faulty gas valve or flame-sense circuit

How to fix it

Confirm propane reaches the fridge, then clean the burner and orifice and check the electrode gap. If it still won’t light, check the gas pressure, gas valve and board.

Related: Norcold not staying lit on gas · Not working on propane but works on AC · Burners & orifices · Gas valves

What it means

The flame-sensing circuit on the power board isn’t working correctly.

Common causes

• Dirty 12V power: AC ripple from a failing converter or inverter
• A failed power board

How to fix it

Rule out dirty DC power first, or a new board can fail the same way. If the power is clean and the code stays, replace the power board.

Related: AC ripple: the silent killer of power boards · 628661 power board · 6212XX upgraded board · Converters & chargers

What it means

On the LED-light N611 and N811, four flashes points to a power board failure.

Common causes

• A failed power board, often damaged by bad incoming power

How to fix it

Replace the power board. The right board depends on your serial number, so check it before you order, or ask a tech.

Related: Norcold power boards

WHEN IT’S NOT THE BOARD

When an error code means the cooling unit has failed

FIND THE RIGHT PART

Shop Norcold parts

FAQ

Common questions about Norcold error codes

How do I reset a Norcold error code?

On most models, turn the fridge off, wait a few seconds, and turn it back on. That clears the code, but it will come back if the cause isn’t fixed. Don’t keep resetting a high-temperature (LI oP) code. See our lockout reset guide.

Why does the same problem show different codes?

Norcold used different control panels over the years. A propane lighting failure shows as “no FL” on a two-part display, “F” on a one-letter display, a flashing GAS light on LED models, and code 3 on the N4000.

Can low battery voltage cause Norcold error codes?

Yes. Low or noisy 12V power causes codes like dc LO, Sr, N4000 code 6, E3 on the N8DC/N10DC, and a slow-blinking ON light on the N15DC/N20DC. The controls need steady 12V even when running on propane or AC.

What’s the difference between the absorption and 12V compressor models?

Absorption fridges (1200/1210, N6 / N8 series, N4000, Polar) cool with heat from propane, 120V or a 12V heater. The N8DC/N10DC and N15DC/N20DC use a 12V compressor like a home fridge, so their codes focus on voltage, wiring, sensors and the compressor.