Fisher & Paykel Refrigerator Error Code 4

Error Code 4 on a Fisher & Paykel refrigerator indicates a faulty filter temperature sensor. The sensor's resistance has dropped below 660 Ohms, which is outside the normal operating range. This is typically caused by a failed sensor or a short in the sensor wiring. The sensor resistance should be measured with a multimeter to confirm the fault.

A reset may temporarily clear the code from the display, but if the underlying sensor fault remains, the code will return once the control board runs its diagnostic checks again. The fault needs to be physically resolved by replacing the faulty sensor or repairing the wiring before the error will stay cleared.

If only the filter temperature sensor needs replacement, parts typically cost in the range of $20 to $60, and the repair is relatively straightforward for a technician. If a professional service call is needed, total costs including labor generally fall in the range of $100 to $250 depending on your location and the service provider. Wiring repairs, if needed, may adjust the final cost.

Start by disconnecting the filter temperature sensor and measuring its resistance with a multimeter. If the reading is below 660 Ohms, the sensor has failed and needs to be replaced. Also inspect the wiring harness and connector for any signs of damage or shorting, as these can produce the same fault code even with a good sensor.

Error Code 4 is primarily a component reliability issue rather than an immediate safety hazard. However, a faulty temperature sensor means the refrigerator's control system is missing accurate data from that sensor location. It is best to address the fault promptly to ensure the refrigerator continues to operate as designed.