Oven displays F5 and may not start or may shut down unexpectedly.

Safety first: Disconnect power at the breaker before removing the control panel or touching any electronics.

Step-by-step checks:

• Power reset: Turn off the breaker for 10 minutes to fully discharge the control board, then restore power and test. If F5 returns, continue.
• Inspect control board: Remove the control panel to access the electronic oven control. Check for burnt components, cracked solder joints, or signs of overheating.
• Check connectors: Reseat all multi-pin connectors on the control board, especially those going to the display, keypad, and relays.
• Verify model configuration: Some Haier boards require correct jumper or software configuration for specific models. If the board was recently replaced, confirm it is the correct part number and configured per the service manual.

When to replace parts: If F5 persists after reseating connectors and power reset, replace the electronic oven control board. Configuration issues may require a technician with access to Haier programming tools.