Freezer over-freezing, temperature much lower than setpoint, items rock hard and brittle.

Safety: Disconnect power before accessing sensors or control boards.

Steps:

• Verify settings: Ensure the set temperature is not at the coldest setting and that any Fast Freeze mode is off.
• Check sensor placement: Locate the freezer thermistor and confirm it is correctly mounted on the liner or evaporator area as designed, not dangling in free air.
• Test thermistor: Measure resistance at known temperatures and compare to Fisher & Paykel specifications. Replace the freezer temperature sensor if readings indicate a short or are out of range.
• Control board: If the sensor is correct but the compressor never cycles off, the main control board may have a stuck relay and should be replaced.