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Error code reference

Fisher & Paykel Refrigerator Error Code 5

Defrost sensor cold

Fisher & Paykel codesFisher & Paykel refrigerator codes

Defrost sensor cold - faulty defrost temperature sensor with resistance out of normal range (resistance greater than 45K Ohms).

First step from the service manual

Check the resistance of the defrost temperature sensor. If faulty, replace.

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

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What 5 means on a Fisher & Paykel refrigerator

Error code 5 on a Fisher & Paykel refrigerator indicates that the defrost temperature sensor is reading in a "cold" fault condition, meaning the sensor's resistance has risen above 45K Ohms. The defrost temperature sensor is a negative temperature coefficient (NTC) thermistor, which means its resistance decreases as temperature increases. When resistance climbs beyond the 45K Ohm threshold, the control board interprets this as an invalid or implausible reading and flags the sensor as faulty rather than continuing to rely on potentially incorrect temperature data.

The defrost system depends on this sensor to determine when the evaporator coil has reached the correct temperature during a defrost cycle, typically signaling that ice has been cleared. If the sensor is out of range, the control board cannot properly terminate the defrost cycle, which can lead to either inadequate defrosting or runaway defrost operation. Both outcomes affect cooling performance and can eventually lead to frost buildup on the evaporator coil.

The most direct cause is a failed thermistor, where the sensor element itself has degraded internally and no longer produces accurate resistance values. However, wiring issues such as a broken conductor, corroded connector pins, or a damaged harness between the sensor and the control board can also cause resistance readings to spike above the 45K Ohm threshold. Diagnosis requires measuring the sensor's resistance directly with a multimeter and comparing it against the expected value for the ambient temperature at the sensor's location.

Source: manufacturer service documentation.

Common causes of 5

  1. 01

    Failed defrost temperature sensor

    Part replacement

    The NTC thermistor element inside the sensor has degraded, causing its resistance to exceed 45K Ohms. This is the most common cause and is confirmed by measuring the sensor's resistance directly with a multimeter.

  2. 02

    Broken or damaged sensor wiring

    Part replacement

    A broken wire or damaged harness between the defrost sensor and the control board can cause an open circuit, which reads as abnormally high resistance. Inspect the wiring along its full length for cuts, pinches, or heat damage.

  3. 03

    Corroded or loose connector pins

    Wiring / connection

    Moisture in the freezer compartment can cause corrosion at the sensor's wiring connector, increasing contact resistance beyond acceptable limits. Disconnect and inspect the connector for green or white oxidation and loose pin seating.

  4. 04

    Sensor displaced from its mounting position

    Wiring / connection

    If the sensor has pulled free from its mounting clip on the evaporator, it may be exposed to temperature extremes it was not designed to measure at that location, producing out-of-range readings. Check that the sensor is properly secured in its bracket.

See the test procedure for each cause

Frequently asked questions about 5

What does 5 mean on a Fisher & Paykel refrigerator?
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.
Can I fix error code 5 on my Fisher & Paykel refrigerator myself?
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.
Will resetting my Fisher & Paykel refrigerator clear error code 5?
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.
Is it safe to keep using my refrigerator when error code 5 is displayed?
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.
How much does it cost to repair error code 5 on a Fisher & Paykel refrigerator?
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.

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