Fisher & Paykel Refrigerator Error Code INV-4

INV-4 indicates an inverter module error, identified by the inverter's onboard LED flashing 4 times. The inverter module controls the variable-speed compressor, and this code means the module has detected an internal fault it cannot recover from. The refrigerator will not cool normally while this fault is active. Replacement of the inverter module is the required repair.

A simple power reset is unlikely to clear INV-4 because the fault is detected internally by the inverter module's own diagnostic circuitry, indicating a hardware failure. If the error returns immediately or shortly after a reset, the inverter module has a genuine internal fault and must be replaced. Resetting is not a reliable fix for this code.

Repair costs for an INV-4 error will vary depending on the specific model and local labor rates. The inverter module itself typically falls in the range of $150 to $350 for parts, with additional labor costs if a technician is hired. Total repair costs including labor generally range from $250 to $550 depending on your location and service provider.

Replacing the inverter module involves working with components that can store electrical charge and requires disconnecting power to the unit before beginning any work. A qualified appliance technician is strongly recommended for this repair. Knowledgeable DIYers comfortable with appliance electronics can perform the replacement, but should exercise caution and ensure the refrigerator is fully unplugged before handling the inverter.

With INV-4 active, the compressor will not operate normally, meaning the refrigerator and freezer compartments will not maintain safe temperatures. Perishable food should be relocated to another refrigerator or kept on ice as soon as possible. The refrigerator should not be relied upon for food storage until the inverter module has been replaced.