Oven beeps and displays F1 shortly after power-up or during idle; keys may not respond or respond erratically.

Safety first: Disconnect the oven from mains power at the breaker before removing any panels. Capacitors on the control board can retain charge; avoid touching bare circuitry.

Step-by-step checks:

• Power reset: Turn off the circuit breaker for 5 minutes, then restore power. If F1 returns immediately, continue.
• Inspect control panel: Remove the upper front trim to access the touch panel and control PCB (refer to Haier service manual for your model). Check for signs of moisture, grease, or corrosion on the keypad area.
• Check ribbon cable: Gently disconnect and reseat the flat ribbon cable between the keypad and the electronic control board. Ensure it is fully inserted and not kinked or damaged.
• Test keypad: With power disconnected, visually inspect the keypad membrane for cracks, bubbling, or physical damage. If keys were sticking or unresponsive before the error, the membrane is likely faulty.
• Board inspection: Examine the oven control PCB for burnt spots, swollen components, or corrosion around the keypad connector.

When to replace parts: If reseating the ribbon cable and drying/cleaning the panel does not clear F1, replace the touch keypad assembly. If the keypad is integrated into the control board (common on some Haier models), replace the electronic oven control board as a complete unit.