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Error code reference

Fisher & Paykel Refrigerator Error Code INV-1

Inverter module error (LED flashes 1 time on inverter).

Fisher & Paykel codesFisher & Paykel refrigerator codes

Inverter module error (LED flashes 1 time 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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  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What INV-1 means on a Fisher & Paykel refrigerator

The INV-1 error code on a Fisher & Paykel refrigerator indicates a fault within the inverter module, which is the component responsible for controlling the variable-speed compressor. The inverter converts DC power into the variable-frequency AC power needed to run the compressor at different speeds depending on the cooling demand. When the inverter module detects an internal fault it cannot recover from, it signals the main control board by flashing its onboard LED once, triggering the INV-1 code on the display.

The inverter module can fail for several reasons, including internal component failure due to age or heat stress, voltage irregularities from the power supply, or a short circuit within the module itself. Because the inverter directly drives the compressor, a fault here will typically result in the compressor failing to start or run, causing the refrigerator to lose cooling capacity entirely. The single LED flash pattern is a diagnostic output from the inverter's own onboard processor, indicating the fault is localized to the inverter rather than an external wiring or sensor issue.

Because the diagnostic step points directly to inverter module replacement, there is limited field-level repair possible within the module itself. Technicians should confirm the inverter is receiving proper input voltage before condemning the part, and inspect wiring harnesses for damage or loose connections at the inverter connector. If power supply and wiring check out, replacing the inverter module is the correct course of action.

Source: manufacturer service documentation.

Common causes of INV-1

  1. 01

    Failed inverter module

    Part replacement

    The inverter module itself has developed an internal fault, which is the most direct cause of INV-1. This is confirmed when the inverter's onboard LED flashes once and no wiring or power supply issues are found.

  2. 02

    Power supply voltage irregularity

    Wiring / connection

    Unstable or incorrect input voltage to the inverter can cause it to fault and display INV-1. Check that the refrigerator is receiving proper supply voltage before replacing the module.

  3. 03

    Loose or damaged wiring harness at the inverter

    Wiring / connection

    A poor connection or damaged wiring between the main control board and the inverter module can trigger communication or power faults. Inspect all connectors at the inverter for corrosion, looseness, or wire damage.

  4. 04

    Overheating of the inverter module

    Wiring / connection

    Excessive heat buildup in the compressor compartment can cause the inverter to fail prematurely. Check that the condenser area is clear of dust and debris and that ventilation is adequate.

  5. 05

    Compressor winding short or open circuit

    Part replacement

    A shorted or open compressor winding can place excessive load on the inverter, causing it to fault. If a new inverter module also faults immediately after installation, the compressor itself should be tested.

See the test procedure for each cause

Frequently asked questions about INV-1

What does INV-1 mean on a Fisher & Paykel refrigerator?
INV-1 indicates a fault has been detected in the inverter module, which is the component that controls the variable-speed compressor. The inverter's onboard LED flashes once to signal an internal error it cannot self-recover from. This fault will typically cause the compressor to stop running, resulting in a loss of cooling in both the refrigerator and freezer compartments.
Can I fix the INV-1 error myself?
Basic checks such as inspecting the power supply and wiring connections at the inverter can be done by a knowledgeable DIYer, but the likely fix is replacing the inverter module, which involves working with high-voltage components inside the refrigerator. This repair is best performed by a qualified technician who can safely handle the electrical components and confirm the correct diagnosis before replacing parts.
Is it safe to keep using my refrigerator when INV-1 is showing?
No, it is not advisable to continue relying on the refrigerator while the INV-1 error is active. Since the inverter module controls the compressor, this fault typically means the unit is not cooling properly, which creates a food safety risk. Perishable items should be moved to an alternate storage location until the repair is completed.
How much does it cost to fix the INV-1 error on a Fisher & Paykel refrigerator?
Repair costs will vary depending on parts pricing and labor rates in your area. The inverter module itself typically ranges from around $150 to $350 or more depending on the specific model, and labor charges for the diagnosis and replacement can add $100 to $200 or more. Getting a quote from a certified technician before proceeding is recommended.
Will resetting the refrigerator clear the INV-1 error code?
A power reset may temporarily clear the displayed error code, but if the inverter module has a genuine internal fault, the INV-1 code will return once the refrigerator attempts to run the compressor again. Resetting the unit does not repair the underlying hardware fault, and the compressor will remain unable to operate normally until the inverter module is replaced.

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