Fisher & Paykel Refrigerator Error Code INV-18

INV-18 indicates that the inverter PCB has exceeded its safe operating temperature. The inverter module controls the variable-speed compressor, and this fault is triggered to protect the board and compressor from heat damage. The refrigerator will not run normally while this fault is active. Replacement of the inverter module is the recommended first step.

No, you should not continue operating the refrigerator normally while this fault is active. The inverter has detected an over-temperature condition and the compressor will not run reliably, meaning food safety could be compromised. Continued operation without addressing the fault risks further damage to the inverter and compressor.

Repair costs vary depending on the specific cause and whether the inverter module needs replacement. Parts and labor for an inverter module replacement typically fall in the range of $200 to $500 or more, depending on your location and the technician's rates. If the fault is caused only by a blocked condenser or ventilation issue, the cost can be significantly lower.

Some contributing factors, such as cleaning condenser coils or improving ventilation around the unit, can be addressed without professional help. However, replacing the inverter PCB involves working with high-voltage components and is best handled by a qualified appliance technician. Attempting inverter replacement without proper training and safety precautions carries a serious risk of electric shock.

A power reset may temporarily clear the fault code, but if the underlying cause of the overheating has not been resolved, the fault will return once the inverter reaches its temperature threshold again. Resetting without repairing the root cause is not a lasting solution and could allow further thermal damage to occur.