Norcold Refrigerator Error Code FL --

The FL -- error code on a Norcold refrigerator indicates that the power board has detected a flame signal when no flame should be present. This condition points directly to a gas valve that is mechanically stuck in the open position, allowing gas to flow and sustain combustion even when the control system has commanded the burner off. The code can appear regardless of which operating mode the refrigerator is in, whether that is AC, DC, or gas mode, because the power board continuously monitors the flame sense circuit and will flag this fault whenever an unexpected flame signal is detected.

The gas valve in an absorption refrigerator controls the flow of LP gas to the burner assembly. When functioning correctly, it opens on command to initiate ignition and closes when the power board ends a heating cycle or shuts the unit down. A valve that is stuck open internally will allow gas to pass through and feed a persistent flame even after the board sends the close command. The power board interprets the continued flame sensor signal as an unsafe condition and triggers the FL -- fault to alert the technician.

This is not a fault that can be resolved by resetting the unit or cycling power. The root cause is a mechanical failure inside the gas valve itself, meaning the internal valve seat or actuator has failed and will not close reliably. Because the fault involves uncontrolled gas flow, the repair priority is high. The diagnostic and corrective action called for is direct replacement of the gas valve. Attempting to clean or adjust a stuck valve is generally not a reliable fix given the safety implications of uncontrolled gas flow.