Freezer shows F9 and may run the fan or compressor unexpectedly or not at all.

Safety warning: Always unplug the freezer before accessing the control board.

Steps:

• 1. Power reset: Disconnect power for 10–15 minutes, then reconnect. If F9 returns immediately, proceed with inspection.
• 2. Access control board: On many IKEA freezers, the main board is located in a plastic or metal housing at the rear or behind the top control panel.
• 3. Visual inspection: Look for burnt components, bulging capacitors, or darkened areas on the PCB. Check for insect infestation or moisture damage.
• 4. Check connectors: Ensure all harness connectors are fully seated and not burnt or loose.
• 5. Replace control board: If visible damage is present or F9 persists after reseating connectors, replace the board with the correct OEM part. Transfer any jumper settings or wiring exactly as on the original.
• 6. Surge protection: After replacement, consider using a surge protector to prevent future damage.

Professional help: Recommended if you are not experienced with electronic assemblies.