mypros+
Error code reference

Fisher & Paykel Refrigerator Error Code INV-12

Compressor starts and stops.

Fisher & Paykel codesFisher & Paykel refrigerator codes

Compressor starts and stops.

First step from the service manual

Let compressor rest for 5 mins to allow pressure to equalise then try again.

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

MyPros+ Max

Get the full diagnostic procedure for INV-12.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What INV-12 means on a Fisher & Paykel refrigerator

The INV-12 error code on a Fisher & Paykel refrigerator indicates that the compressor inverter has detected an abnormal start and stop pattern in the compressor's operation. The inverter board controls the variable-speed compressor by regulating the frequency and voltage supplied to it. When the compressor attempts to start but cuts out before reaching a stable operating state, the inverter registers this fault and triggers the INV-12 code. This behavior is distinct from a compressor that simply fails to start at all, because here the unit is making repeated attempts to run before shutting down.

One of the most common underlying causes is high refrigerant pressure on the high side of the sealed system. When the compressor has been off for a short period, pressure differentials between the high and low sides of the system may not have had time to equalize. The compressor then struggles to start against this elevated head pressure and overloads, causing the inverter to cut power as a protective measure. Allowing the compressor to rest for at least five minutes gives refrigerant pressure time to balance across the system, which can resolve the condition without any further intervention.

If the fault persists after the pressure equalization period, additional causes should be investigated. These include faults within the inverter board itself, electrical supply irregularities, mechanical resistance inside the compressor, or thermal overload conditions. Each of these scenarios places excess load on the inverter drive circuit, triggering the same protective shutdown and error display.

Source: manufacturer service documentation.

Common causes of INV-12

  1. 01

    Unequalized refrigerant pressure

    Wiring / connection

    If the compressor was recently running and then stopped, high-side refrigerant pressure may not have had time to equalize with the low side. This pressure imbalance creates excessive load at startup, causing the inverter to shut the compressor down. Allowing a five-minute rest period is the first recommended step.

  2. 02

    Inverter board fault

    Part replacement

    The inverter board controls power delivery to the compressor and can develop faults that cause it to cut the compressor off prematurely during startup. If the error returns consistently after pressure has equalized, the inverter board should be tested and inspected for damage or failed components.

  3. 03

    Compressor mechanical failure

    Part replacement

    Internal mechanical wear or seizure within the compressor can create resistance that prevents it from reaching running speed. The inverter detects the resulting overcurrent or stall condition and shuts down to protect the circuit.

  4. 04

    Electrical supply irregularities

    Wiring / connection

    Low supply voltage or fluctuating power to the refrigerator can prevent the inverter from delivering adequate starting power to the compressor. Check that the outlet voltage is within the specified range and that the power cord and connections are secure.

  5. 05

    Thermal overload condition

    Wiring / connection

    If the compressor or inverter has overheated due to poor ventilation or an extended fault condition, thermal protection circuits may be cutting operation short. Ensure adequate clearance around the refrigerator and that condenser coils are free of dust buildup.

See the test procedure for each cause

Frequently asked questions about INV-12

What does INV-12 mean on a Fisher & Paykel refrigerator?
INV-12 means the refrigerator's inverter system has detected that the compressor is starting and then stopping before it can run normally. The inverter board, which controls power to the variable-speed compressor, shuts the compressor down as a protective measure when it cannot reach stable operation. This can result from high refrigerant pressure, an inverter fault, or a compressor issue. The first step is to allow the unit to rest for five minutes so refrigerant pressure can equalize before the compressor attempts to start again.
How do I fix the INV-12 error on my Fisher & Paykel refrigerator?
Begin by unplugging the refrigerator or switching it off at the circuit breaker for at least five minutes. This rest period allows refrigerant pressure to equalize across the sealed system, which is the most common cause of the fault. After five minutes, restore power and observe whether the compressor starts and runs normally. If the INV-12 error returns, the issue likely involves the inverter board or the compressor itself and will require hands-on diagnosis by a qualified technician.
Will resetting my Fisher & Paykel refrigerator clear the INV-12 error?
A reset by powering the unit off for five minutes can clear the error if the underlying cause was simply unequalized refrigerant pressure, which is a temporary condition. However, if there is a fault with the inverter board, compressor, or electrical supply, the error will return after the reset because the root problem has not been addressed. A persistent INV-12 code after multiple resets indicates a component issue that needs further diagnosis.
Is the INV-12 error on a Fisher & Paykel refrigerator dangerous?
The INV-12 fault is not a safety hazard to people or property in the way that gas or fire-related faults can be. However, a compressor that is repeatedly starting and stopping will not maintain proper cooling temperatures, which means food safety becomes a concern if the condition is not resolved promptly. The inverter's protective shutdown behavior is by design and prevents damage to the electrical components. Address the fault as soon as possible to protect both the appliance and stored food.
How much does it cost to repair an INV-12 error on a Fisher & Paykel refrigerator?
If the fault resolves after a five-minute pressure equalization rest, there is no repair cost involved. If the inverter board needs replacement, parts and labor costs typically range from $200 to $500 depending on the specific model and local labor rates. A compressor replacement is a more substantial repair and can range from $400 to $800 or higher. Getting a diagnostic assessment from a technician before committing to parts is advisable, as it helps confirm which component is at fault.

Related Fisher & Paykel refrigerator codes

All Fisher & Paykel refrigerator codes
View all 71 Fisher & Paykel refrigerator codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass