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Error code reference

Polar Refrigerator Error Code no FL

The burner did not ignite or re-ignite; no flame sensed at burner when there should be one (N7LX/N8LX models).

Polar codesPolar refrigerator codes

The burner did not ignite or re-ignite; no flame sensed at burner when there should be one (N7LX/N8LX models).

First step from the service manual

Verify propane gas tank valve is open, manual shut-off valve is open, gas pressure is 10.5 in. W.C., then check if burner is clean.

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

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What no FL means on a Polar refrigerator

The no FL error code on Polar N7LX and N8LX refrigerators indicates that the control board attempted to ignite the burner but did not detect a flame signal within the allotted trial period, or that an established flame was lost during operation and could not be re-ignited. This is a gas absorption refrigeration system, and the burner is the heat source that drives the absorption cooling cycle. When the flame sensor fails to confirm combustion, the system locks out and displays no FL to prevent unburned gas from accumulating.

The flame sensing circuit works by detecting the presence of an ionization current or a thermocouple-type signal at the burner head. If the gas supply is interrupted, pressure is insufficient, or the burner orifice is blocked, ignition will fail and the sensor will report no flame. The specified operating gas pressure for these models is 10.5 inches water column (in. W.C.). Pressure above or below this value can prevent reliable ignition even if the supply valve is open.

Burner contamination is a frequent cause on units used in mobile or outdoor environments. Dust, insects, rust, and carbon deposits can block the orifice or interfere with the spark gap, preventing ignition even when gas pressure is correct. In addition, a faulty igniter, a degraded flame sensor, or a wiring fault between the sensor and the control board can cause the no FL lockout even when the burner itself is functioning normally. Systematic diagnosis starting with the gas supply and working toward the electrical components will isolate the fault efficiently.

Source: manufacturer service documentation.

Common causes of no FL

  1. 01

    Closed or low gas supply

    Wiring / connection

    The propane tank valve or manual shut-off valve may be closed, the tank may be nearly empty, or the regulator may not be delivering the required 10.5 in. W.C. pressure. Confirm the tank has fuel, both valves are fully open, and pressure is verified at the appliance inlet.

  2. 02

    Blocked or dirty burner orifice

    Wiring / connection

    Debris, carbon buildup, or insect nesting material in the burner orifice or burner tube can prevent gas flow and ignition. Inspect and clean the burner assembly to restore proper gas flow.

  3. 03

    Faulty or fouled igniter

    Part replacement

    The igniter electrode may be cracked, corroded, or have an incorrect gap, resulting in a weak or absent spark. Visually inspect the electrode for damage and confirm a strong, consistent spark during an ignition attempt.

  4. 04

    Failed flame sensor

    Part replacement

    If the flame sensor is coated with residue or has failed electrically, it cannot confirm combustion to the control board even when the burner is lit. A sensor that reads out of specification or shows an open circuit will need to be replaced.

  5. 05

    Control board or wiring fault

    Part replacement

    Damaged wiring, corroded connectors, or a defective control board can interrupt the ignition sequence or prevent the flame signal from being received. Check all wiring connections to the igniter and flame sensor for continuity and secure contact before condemning the board.

See the test procedure for each cause

Frequently asked questions about no FL

What does no FL mean on a Polar refrigerator?
The no FL code on Polar N7LX and N8LX refrigerators means the burner failed to ignite or lost its flame during operation and could not re-ignite. The control system requires confirmation of a flame signal before allowing the absorption cooling cycle to run. The unit locks out and displays this code as a safety measure to prevent unburned gas buildup. Restoring proper ignition requires checking gas supply, burner condition, and the ignition components.
How do I fix the no FL error on my Polar refrigerator?
Start by confirming the propane tank has fuel, both the tank valve and the manual shut-off valve are fully open, and gas pressure at the appliance is 10.5 in. W.C. Next, inspect the burner for dirt, debris, or blockages and clean it as needed. If the gas supply and burner are in good condition, check the igniter electrode for damage and verify the flame sensor is functioning correctly. If those components test acceptable, inspect the wiring and connectors between the sensor, igniter, and control board.
Is the no FL error on a Polar refrigerator a safety issue?
Yes, the no FL condition is treated as a safety lockout because unconfirmed ignition means gas could be released without combustion occurring. The unit intentionally stops the ignition attempt and displays the code to alert the user. Do not repeatedly attempt to restart the unit in an enclosed space if you suspect a gas supply issue. Ensure the area is ventilated and address the root cause before resuming operation.
Will resetting the Polar refrigerator clear the no FL error?
A reset may clear the lockout temporarily and allow the unit to attempt ignition again, but if the underlying cause is not resolved the code will return immediately. Common causes such as low gas pressure, a blocked burner, or a failed igniter must be corrected first. Simply resetting without diagnosing the fault is not a reliable fix and repeated lockouts can indicate a more serious component failure.
How much does it cost to repair a no FL error on a Polar refrigerator?
If the fix is simply cleaning the burner or opening a closed valve, the repair involves no parts cost and only the time for diagnosis and cleaning. Replacement components such as an igniter electrode or flame sensor typically range from around $20 to $80 depending on the part. If a control board replacement is required, costs can range from $100 to $250 or more for the part alone. Adding professional labor charges will increase the total, so performing basic gas supply and burner checks yourself first can help avoid unnecessary service calls.

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