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Error code reference

Polar Refrigerator Error Code Sr

Internal fault detected by the main control board (power board); can be displayed in any mode (N7LX/N8LX…

Polar codesPolar refrigerator codes

Internal fault detected by the main control board (power board); can be displayed in any mode (N7LX/N8LX models).

First step from the service manual

Verify gas valve wires are plugged in, then power refrigerator OFF and back ON to reset.

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

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What Sr means on a Polar refrigerator

The Sr error code on Polar refrigerators (specifically N7LX and N8LX models) indicates that the main control board, also referred to as the power board, has detected an internal fault condition. This code can appear regardless of what operating mode the refrigerator is currently running in, making it a board-level diagnostic signal rather than a mode-specific sensor alarm. When the power board detects an anomaly it cannot resolve through normal operation, it triggers the Sr code to alert the technician that something within the control circuit or a connected component requires attention.

The most common entry point for diagnosing Sr is the gas valve wiring harness. Loose, disconnected, or damaged wires at the gas valve connector can cause the control board to register an internal fault because it loses expected continuity or voltage feedback from that circuit. Before assuming the board itself has failed, technicians should physically inspect all wiring connections at the gas valve, ensuring each connector is fully seated and free of corrosion or damage.

If wiring checks out and the error persists after a full power cycle (switching the unit completely off and then back on), the fault likely points to a deeper issue within the control board itself, such as a failed relay, a damaged trace, or a component that is no longer reading within acceptable parameters. A power cycle is often enough to clear transient faults caused by voltage spikes or temporary signal drops, but a recurring Sr code after reset strongly suggests a hardware problem requiring board inspection or replacement.

Source: manufacturer service documentation.

Common causes of Sr

  1. 01

    Disconnected or loose gas valve wiring

    Wiring / connection

    The gas valve wiring harness may have become unplugged or loosely connected, causing the control board to detect a missing or inconsistent signal. Visually inspect the gas valve connectors and firmly reseat any that appear loose.

  2. 02

    Transient voltage spike or power interruption

    Wiring / connection

    A brief power surge or interruption can cause the control board to log an internal fault and display Sr. Performing a full power cycle by turning the refrigerator off and back on will often clear this type of one-time fault.

  3. 03

    Corroded or damaged wiring harness connectors

    Wiring / connection

    Corrosion or physical damage at the gas valve connector pins can create resistance or an open circuit that the board interprets as an internal fault. Inspect connector terminals for discoloration, oxidation, or bent pins.

  4. 04

    Failed main control board (power board)

    Part replacement

    If the Sr code returns immediately after a power cycle and all wiring connections are secure, the power board itself may have a failed component such as a relay or damaged circuit. Board replacement is typically needed in this scenario.

  5. 05

    Faulty gas valve

    Part replacement

    A gas valve that has failed internally can send an unexpected signal back to the control board, triggering the Sr fault code. If wiring is intact and the board appears functional, the gas valve itself should be tested for proper operation.

See the test procedure for each cause

Frequently asked questions about Sr

What does Sr mean on a Polar refrigerator?
Sr indicates that the main control board (power board) has detected an internal fault. It can appear in any operating mode on N7LX and N8LX models. The fault may be triggered by a wiring issue at the gas valve or by a problem within the board itself. Checking the gas valve wiring connections and performing a power cycle are the first recommended diagnostic steps.
Will resetting my Polar refrigerator clear the Sr error code?
A power cycle, turning the unit completely off and then back on, will clear the Sr code if the fault was caused by a transient event such as a voltage spike or temporary signal loss. However, if the underlying issue is a loose wire or a failed component, the code will return after the reset. Always check the gas valve wiring before and after the reset to determine whether the fault is recurring.
How do I fix the Sr error on a Polar N7LX or N8LX refrigerator?
Start by verifying that the gas valve wiring harness is fully plugged in and that all connector pins are clean and undamaged. After confirming the wiring, power the refrigerator off and then back on to reset the board. If the Sr code reappears, the main control board or the gas valve may need to be tested further and potentially replaced.
Is the Sr error code on a Polar refrigerator a safety concern?
The Sr code signals an internal fault detected by the control board, which means the refrigerator may not be operating normally. Until the fault is resolved, the unit could have compromised cooling performance. It is advisable to address the error promptly and avoid storing perishable items until the problem has been diagnosed and corrected.
How much does it cost to repair a Polar refrigerator showing the Sr error code?
Repair costs depend on the root cause. If the fix is simply reseating a loose wiring connector, there may be no parts cost involved, though a service call fee typically ranges from $75 to $150. If the main control board requires replacement, parts and labor combined can range from $200 to $450 or more depending on parts availability and local labor rates.

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