Fisher & Paykel Refrigerator Error Code 5

Error code 5 indicates a faulty defrost temperature sensor with a resistance reading greater than 45K Ohms, which is outside the normal operating range. The control board flags this as a "defrost sensor cold" fault because the sensor value is implausible. The refrigerator cannot reliably manage its defrost cycle until the sensor is tested and replaced if faulty.

Resetting the refrigerator may temporarily clear the displayed code, but the fault will return if the defrost sensor's resistance remains above 45K Ohms. The underlying hardware problem must be corrected, either by repairing the wiring or replacing the sensor, before the error will stay cleared.

If the defrost temperature sensor itself is the cause, the part is generally low-cost, though total repair cost including labor can range from around $100 to $250 depending on your location and the technician's rates. If the issue turns out to be a wiring harness or connector repair, costs may vary. Getting a diagnostic visit from a qualified technician will give you a more precise estimate.

A knowledgeable DIYer can diagnose this fault by using a multimeter to measure the resistance of the defrost temperature sensor. If the resistance reads above 45K Ohms, the sensor needs to be replaced. Accessing the evaporator and sensor typically requires removing the freezer interior panels, so comfort with basic appliance disassembly is needed.

With error code 5 active, the defrost cycle cannot operate correctly, which can lead to frost accumulation on the evaporator coil over time. Continued use without repair may result in reduced cooling performance or a fully blocked evaporator. It is advisable to have the sensor inspected and replaced promptly to avoid further issues.