When the touch control panel and digital keypad on a residential microwave oven completely stop responding to button presses, the malfunction is typically caused by a ribbon cable disconnect between the overlay and control board, moisture ingress behind the tactile membrane switches, or an active child safety lock feature. Many modern microwaves feature a safety lock that disables the keypad when engaged. If the buttons remain dead after disabling the lock, the electronic control board or membrane switch has failed. You can troubleshoot control lockups easily by unplugging the unit for two minutes. You can verify that your corrective action is successful when resetting power, unlocking the child lock, drying internal moisture, or replacing a faulty touch control interface panel restores normal button responsiveness.
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