Fisher & Paykel Refrigerator Error Code INV-17

INV-17 is a thermal protection fault generated by the inverter board when the motor bridge temperature exceeds 100°C (212°F). The motor bridge refers to the H-bridge circuit on the inverter that drives the compressor motor, switching current through the motor windings at high frequency. When this circuit overheats, the inverter's onboard thermal sensor triggers the fault to prevent damage to the switching transistors and surrounding components. This is a self-protective shutdown, not simply a warning.

The most common root cause is inadequate heat dissipation around the inverter and compressor assembly. Blocked condenser air grills restrict airflow across the heat-generating components, causing temperatures to climb well beyond safe operating limits. A failed or underperforming condenser fan compounds this problem significantly, since the fan is responsible for actively moving cool air across the condenser and inverter heat sink. Dust and debris accumulation on the condenser grills is particularly common in household environments and is the first thing to inspect.

If airflow is confirmed to be adequate and the condenser fan is operating correctly, the fault may point to a failing inverter board with degraded thermal interface material, a compressor drawing excessive current due to mechanical wear, or a refrigerant charge issue causing the compressor to run harder and longer than normal. Each of these conditions forces the motor bridge to work harder and generate more heat. Systematic diagnosis starting with the simplest airflow checks before moving to electrical and refrigerant system testing is the correct approach.