Microwave beeps and displays F1, will not start a cook cycle or stops shortly after starting.

Safety first: Unplug the microwave or switch off the dedicated circuit breaker before any disassembly. High-voltage components inside a microwave can retain a dangerous charge even when unplugged. Do not touch the high-voltage capacitor or magnetron area.

Step-by-step checks:

• Power reset: Unplug the unit for 5–10 minutes, then plug back in. If F1 clears temporarily and returns when pressing certain buttons, the keypad is likely shorted.
• Inspect keypad ribbon: Remove the control panel (usually by removing the top grille and one or two screws securing the panel). Gently pull the control panel forward and locate the flat ribbon cable from the keypad to the control board. Check for corrosion, moisture, or damage. Reseat the ribbon firmly.
• Test keypad response: With power restored and the panel reinstalled, test multiple buttons. If random beeping or F1 returns when pressing specific keys, the membrane keypad is defective.
• Control board check: If F1 appears immediately at power-up without pressing any keys, the electronic control board may be at fault.

When to replace parts:

• If the keypad overlay is separate from the control board, replace the membrane keypad / control panel assembly.
• If the keypad is integrated into the control board and sold as one unit, replace the electronic control board (ERC).

Warning: If you are not experienced with appliance repair, especially with microwaves, contact a qualified technician. Do not operate the microwave with the control panel disassembled.