Safety first: Unplug the unit before panel removal.

Surface cleaning: Clean the touch surface with a soft, slightly damp cloth and then dry. Remove any grease film that may interfere with capacitive sensing.
Drying: If the panel was recently cleaned with excessive liquid, allow the unit to dry for 24 hours in a warm, dry place before further testing.
Connector check: Open the control panel and reseat the connector between the touch control PCB and main board.
Panel replacement: If specific keys never respond and the PCB shows cracks or burn marks, replace the touch control panel assembly.

Touch buttons are unresponsive or respond intermittently.

Possible Causes