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Error code reference

Fisher & Paykel Refrigerator Error Code INV-5

Inverter module error (LED flashes 5 times on inverter).

Fisher & Paykel codesFisher & Paykel refrigerator codes

Inverter module error (LED flashes 5 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-5 means on a Fisher & Paykel refrigerator

The INV-5 error code on a Fisher & Paykel refrigerator indicates a fault within the inverter module, specifically signaled by the inverter's onboard LED flashing 5 times in sequence. The inverter module is responsible for driving the variable-speed compressor, converting DC power into the controlled AC frequency needed to regulate compressor speed and cooling output. When the inverter detects an internal fault condition severe enough to trigger the 5-flash code, it halts normal operation to prevent further damage to the compressor or electrical components.

The 5-flash pattern is a self-diagnostic signal generated by the inverter module itself, meaning the fault has been identified internally rather than by an external sensor or control board. This distinguishes INV-5 from wiring or thermistor faults. Causes can include internal component failure within the inverter circuit, power supply irregularities that stress the module over time, or heat-related degradation if airflow around the inverter is restricted.

Because the inverter module performs its own fault detection and signals the fault directly through its LED, the primary diagnostic step is replacement of the inverter module. There is limited value in attempting to test individual components inside the module, as the unit is not designed for component-level repair in the field. Confirming the LED flash count and ruling out external power supply issues before replacement is good practice.

Source: manufacturer service documentation.

Common causes of INV-5

  1. 01

    Failed inverter module

    Part replacement

    The inverter module itself has developed an internal fault, which it signals by flashing its LED 5 times. Replacement of the module is the standard resolution.

  2. 02

    Power supply irregularities

    Wiring / connection

    Voltage spikes, sustained undervoltage, or unstable mains power can stress the inverter module over time and lead to internal component failure. Check that supply voltage is stable and within the required range.

  3. 03

    Overheating of the inverter module

    Wiring / connection

    Restricted airflow around the inverter module due to dust buildup or improper installation clearances can cause thermal stress that triggers a fault. Inspect the area around the inverter for obstructions or heavy dust accumulation.

  4. 04

    Wiring or connection fault to the inverter

    Wiring / connection

    Loose, corroded, or damaged wiring connections at the inverter module can cause the module to behave erratically or log an internal fault. Inspect all connectors at the inverter for secure seating and signs of corrosion.

See the test procedure for each cause

Frequently asked questions about INV-5

What does INV-5 mean on a Fisher & Paykel refrigerator?
INV-5 indicates an inverter module error, identified by the inverter's onboard LED flashing 5 times. The inverter module controls the variable-speed compressor, and this code means the module has detected an internal fault serious enough to stop normal operation. The refrigerator will not cool properly while this fault is active.
Can I fix the INV-5 error myself?
The recommended fix is replacement of the inverter module, which involves working with electrical components connected to mains power. While a knowledgeable DIYer can perform this repair, it requires proper electrical safety precautions and comfort working inside the refrigerator's sealed sections. If you are unsure, a qualified appliance technician should handle the replacement.
Is it safe to use my refrigerator while the INV-5 code is showing?
When INV-5 is active, the compressor is not running normally, meaning the refrigerator is not maintaining safe temperatures. Food safety is a concern if the fault persists for more than a few hours. It is best to transfer perishables to another refrigerator and have the fault repaired promptly.
How much does it cost to repair an INV-5 error on a Fisher & Paykel refrigerator?
Repair costs will vary depending on your region and whether you use an authorized service technician or a third-party repairer. Parts and labor for an inverter module replacement typically fall in the range of $200 to $500, though prices can vary based on the specific model and local labor rates.
Will resetting the refrigerator clear the INV-5 error code?
A power reset may temporarily clear the displayed fault, but if the inverter module has a genuine internal fault, the INV-5 code will return once the refrigerator attempts to operate the compressor again. Resetting the unit does not repair the underlying hardware failure. Replacement of the inverter module is required for a lasting fix.

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