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Error code reference

Polar Refrigerator Error Code FL --

A flame is sensed at the burner when there should be none present; gas valve is mechanically stuck open…

Polar codesPolar refrigerator codes

A flame is sensed at the burner when there should be none present; gas valve is mechanically stuck open (N7LX/N8LX models).

First step from the service manual

Replace gas train assembly.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What FL -- means on a Polar refrigerator

The FL -- error code on Polar N7LX and N8LX refrigerators indicates that the flame sensor is detecting a flame at the burner during a period when no flame should be present. This is a gas control fault specific to absorption-style refrigeration systems, where a propane or natural gas burner provides the heat source needed to drive the refrigeration cycle. Under normal operation, the gas valve opens on demand, ignites the burner, and closes when the setpoint is reached. When FL -- appears, the control board has confirmed that the flame sensor is reading active combustion even though the command state calls for the burner to be off.

The primary cause identified for this fault in N7LX and N8LX models is a gas valve that is mechanically stuck in the open position. A stuck-open gas valve allows gas to continue flowing to the burner even after the control board has sent the signal to close. This creates a persistent flame condition that the sensor accurately detects and reports. Unlike electrical faults where sensor drift or wiring issues might trigger a false positive, FL -- specifically points to the valve failing to close rather than a sensing anomaly.

Because the gas valve is an integrated component of the gas train assembly on these models, the recommended corrective action is replacement of the entire gas train assembly rather than attempting to service or free a stuck valve in isolation. Continuing to operate the appliance with FL -- active presents a safety concern, as uncontrolled gas flow and combustion can lead to overheating or potential hazard conditions. The unit should be shut down and gas supply isolated until the repair is completed.

Source: manufacturer service documentation.

Common causes of FL --

  1. 01

    Gas valve mechanically stuck open

    Part replacement

    The gas valve inside the gas train assembly has failed in the open position, allowing continuous gas flow and sustained combustion when the control board calls for burner shutdown. This is the primary cause of FL -- on N7LX and N8LX models and requires gas train assembly replacement.

  2. 02

    Failed gas train assembly

    Part replacement

    The gas train assembly as a whole may have an internal mechanical or seal failure that prevents the valve from closing properly. Because the valve is not a separately serviceable component on these models, the entire assembly must be replaced.

  3. 03

    Flame sensor reporting accurately on a stuck valve

    Wiring / connection

    In this fault scenario, the flame sensor itself is typically functioning correctly and reporting a real condition. If the sensor output is suspected, confirm that the flame is genuinely present at the burner before assuming a sensor fault.

  4. 04

    Gas supply not fully shut off externally

    Wiring / connection

    If an upstream manual shutoff valve is partially open or not seating fully, residual gas pressure may allow a small flame to persist. Verify that the supply valve fully closes as part of initial diagnosis.

See the test procedure for each cause

Frequently asked questions about FL --

What does FL -- mean on a Polar refrigerator?
FL -- means the refrigerator's flame sensor has detected an active flame at the burner when the burner is supposed to be off. On Polar N7LX and N8LX models, this fault is caused by the gas valve being mechanically stuck in the open position, allowing gas to continue flowing and burning. The control board triggers this code to alert you to the uncontrolled combustion condition. The gas supply should be shut off and the unit taken out of service until the gas train assembly is replaced.
Can I fix the FL -- error myself on a Polar refrigerator?
The repair requires replacing the gas train assembly, which involves working directly with gas supply lines and combustion components. This type of repair is generally best handled by a qualified appliance technician or gas engineer. Attempting to free or repair the stuck gas valve independently is not recommended, as the valve is part of an integrated assembly. Always shut off the gas supply at the source before beginning any inspection.
Is the FL -- error on a Polar refrigerator a safety hazard?
Yes, FL -- represents a genuine safety concern. A gas valve stuck open allows uncontrolled combustion to continue beyond the normal operating cycle, which can cause overheating and poses a risk of fire or other hazards. You should turn off the appliance, shut off the gas supply at the nearest shutoff valve, and ensure the area is well ventilated. Do not continue operating the refrigerator until the gas train assembly has been replaced.
Will resetting the Polar refrigerator clear the FL -- error code?
Resetting the control board will not resolve the underlying fault. The FL -- code is triggered by a real mechanical failure of the gas valve, and the condition will recur immediately or persist as long as the valve remains stuck open. The only way to clear this fault permanently is to replace the gas train assembly and restore proper valve operation.
How much does it cost to repair a Polar refrigerator showing the FL -- error?
Repair costs depend on parts pricing for the gas train assembly and local labor rates, but you can generally expect to budget in the range of $150 to $450 or more depending on parts availability and technician fees. Gas appliance repairs typically carry a higher labor cost due to the safety certifications required. Obtaining a quote from a qualified technician before proceeding is advisable.

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