Freezer shows F5, compressor may not start or may run erratically, temperature rises.

Safety: Unplug the freezer. Work in a well-ventilated area. Do not open the sealed refrigeration system.

Steps:

• Listen for compressor behavior: After plugging in (for testing only), does the compressor click and stop, hum loudly, or stay off? Unplug again before proceeding.
• Access compressor compartment: Remove the rear lower service panel to expose the compressor, start device, and control board.
• Inspect start device: On non-inverter models, remove the start relay/overload from the compressor terminals. Check for burn marks, rattling pieces inside, or melted plastic. Replace the compressor start relay/overload if damaged.
• Check wiring: Ensure all connectors between the main control board, start device/inverter, and compressor are fully seated and not corroded.
• Inverter models: If your Fisher & Paykel freezer uses an inverter compressor, verify the inverter module has proper DC supply from the main board (technician-level test). A flashing LED on the inverter may indicate a fault.
• Compressor test: Only a qualified technician should test compressor windings and current draw. If the compressor is shorted or locked, it must be replaced by a professional.

Important: Because this fault involves high-voltage and sealed-system components, most homeowners should contact an authorized Fisher & Paykel technician for final diagnosis and repair.