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Error code reference

Fisher & Paykel Refrigerator Error Code INV-6

Inverter module error (LED flashes 6 times on inverter).

Fisher & Paykel codesFisher & Paykel refrigerator codes

Inverter module error (LED flashes 6 times on inverter).

First step from the service manual

Replace inverter module.

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

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What INV-6 means on a Fisher & Paykel refrigerator

The INV-6 error code on a Fisher & Paykel refrigerator indicates a fault within the inverter module, confirmed by the inverter's onboard LED flashing six times in sequence. The inverter module is responsible for converting DC voltage to variable-frequency AC power used to drive the variable-speed compressor. When the inverter detects an internal fault condition that falls outside normal operating parameters, it signals the failure through this LED flash code and communicates the error to the main control board.

Inverter module faults can stem from several conditions including internal component failure, overheating due to inadequate ventilation, voltage irregularities from the power supply, or degradation of the module's internal circuitry over time. Because the inverter directly controls compressor speed and operation, a fault here will typically result in the compressor failing to run, causing the refrigerator to lose cooling capacity entirely or perform very poorly.

The primary diagnostic path for INV-6 is replacement of the inverter module itself. Since the fault is detected and reported by the inverter's own internal diagnostics, the module is considered the failed component. Before replacement, it is worth confirming that incoming power to the inverter is clean and within specification, and that the module is not overheating due to blocked airflow around the compressor compartment. If power supply and ventilation check out normally, the inverter module requires replacement to resolve the fault.

Source: manufacturer service documentation.

Common causes of INV-6

  1. 01

    Failed inverter module

    Part replacement

    Internal component failure within the inverter module itself is the most direct cause of the INV-6 code, as the fault is self-reported by the module's own diagnostics. Replacement of the inverter module is the primary corrective action.

  2. 02

    Inverter module overheating

    Wiring / connection

    Insufficient airflow around the compressor compartment can cause the inverter to overheat, triggering an internal protection fault. Check for blocked vents, dust buildup, or objects restricting airflow near the back or underside of the unit.

  3. 03

    Unstable or low supply voltage

    Wiring / connection

    Voltage fluctuations or low incoming line voltage can stress the inverter's internal circuitry and trigger a fault condition. Check the outlet voltage with a multimeter to confirm it is within the required operating range for the appliance.

  4. 04

    Wiring or connection fault between inverter and control board

    Wiring / connection

    Loose, corroded, or damaged wiring harness connections between the inverter module and the main control board can disrupt communication and trigger error reporting. Inspect all connectors at both ends for secure seating and signs of corrosion or damage.

  5. 05

    Compressor-side fault loading the inverter

    Part replacement

    A mechanically seized or electrically shorted compressor can place excessive load on the inverter, causing it to fault. If the inverter module replacement does not resolve the issue, the compressor itself should be tested.

See the test procedure for each cause

Frequently asked questions about INV-6

What does INV-6 mean on a Fisher & Paykel refrigerator?
INV-6 indicates a fault detected within the inverter module, which is the component that controls the variable-speed compressor. The inverter's onboard LED flashes six times to signal this internal fault condition. Because the compressor cannot operate correctly, the refrigerator will typically lose its ability to cool properly. Replacement of the inverter module is the recommended corrective action.
Can I fix the INV-6 error myself, or do I need a technician?
Replacing an inverter module involves working in close proximity to high-voltage components, including capacitors that can retain a dangerous charge even after the unit is unplugged. This repair is best handled by a qualified appliance technician. Knowledgeable DIYers comfortable with appliance electronics can attempt the repair, but precautions around residual capacitor charge are essential before touching any internal components.
Is it safe to keep using my refrigerator while the INV-6 code is active?
When INV-6 is active, the compressor is typically not running, meaning the refrigerator is not maintaining safe temperatures for food storage. Perishable foods should be moved to another refrigerator or kept in a cooler with ice until the fault is repaired. Continuing to store food in the unit while this fault is present risks spoilage and potential foodborne illness.
Will resetting the refrigerator clear the INV-6 error?
A power reset by unplugging the unit for several minutes may temporarily clear the error display, but if the inverter module has a genuine internal fault, the code will return once the refrigerator attempts to run the compressor again. Resetting does not repair the underlying hardware failure. Replacement of the inverter module is necessary for a lasting fix.
How much does it cost to repair an INV-6 error on a Fisher & Paykel refrigerator?
Repair costs vary depending on parts availability and local labor rates. The inverter module itself typically falls in the range of $150 to $350 for the part alone. Adding professional labor, total repair costs generally range from $250 to $550. If the underlying cause turns out to be the compressor rather than the inverter, costs will be significantly higher.

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