RV Refrigerator Error Code Guide | Model-Specific Fault Help
Refrigerator warning lights and fault messages are specific to the model and control-panel version. Start by identifying the full model on the data label. The code table below covers Norcold Polar N7LX and N8LX displays; do not apply these meanings to unrelated refrigerator models.
How to use this guide: Confirm the full model number on your data label, then match the exact two-part message shown on the display. Open each code below for a plain-language explanation. Do not order a control board based only on the code.
Norcold Polar N7LX / N8LX fault-message reference
Match the exact alternating message on the panel. These descriptions are summarized from Norcold Owner's Manual 639301F (March 27, 2025), fault-code section. The manufacturer's manual remains the authoritative source.
no / FL — burner ignition failure
The burner did not light or relight. Check that the propane tank valve is open and that the RV has an adequate fuel supply. Air in the gas supply line can also cause this warning. The manual describes switching the unit off and back on to reset it; if the warning persists, seek authorized service.
no / AC — AC power unavailable
The refrigerator is not receiving usable AC power. Confirm that shore power or generator power is available, that the refrigerator is plugged into a working receptacle, and that the RV's relevant breaker has not tripped. Follow the model manual if the fault continues.
AC / HE — AC heater fault
This identifies an issue related to the AC heater. Norcold lists this as not owner-serviceable; use an authorized service technician rather than bypassing or testing energized heater circuits.
AC / rE — control-system fault
The fault is within the refrigerator controls. Norcold lists this as a service issue, not a diagnosis that any single board is definitely defective.
Lo / dc — low DC supply voltage
DC input voltage at the refrigerator is too low. Check the RV's battery charging equipment and converter status. Have wiring and electrical faults inspected as needed.
HI / dc — high DC supply voltage
DC input voltage is too high. Check the charging equipment and converter. If the fault persists, arrange qualified service.
oP / LI or Sr — electronic-control fault
These warnings indicate a fault in the refrigerator electronic controls on the covered models. Refer to the manufacturer's service guidance before selecting a replacement component.
FL / -- — unexpected flame detected
The controls report flame sensing when a flame should not be present. The manual marks this as not owner-serviceable. Stop troubleshooting and arrange authorized service.
Find the right manual and parts list
Norcold Polar N7/N8 owner's manual (PDF) · Browse refrigerator OEM parts diagrams · Find parts by refrigerator model
Safety before troubleshooting
If you smell ammonia or suspect a failed absorption cooling unit, stop using the refrigerator and arrange qualified service. If you smell propane, leave the area and follow your gas supplier's emergency directions; do not operate switches or ignition sources. Do not bypass safety cutoffs, open electrical controls, or attempt sealed cooling-unit repairs.
Important: A fault code describes a condition, not proof that a particular replacement part has failed. The exact model, controls and serial range must be checked before ordering.
Shopping guidance: To find compatible parts, identify your refrigerator's OEM part number in the parts-diagram directory before browsing control boards. A fault code is not proof of a failed board.
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