Safety: Unplug the unit before working on the control panel.

Steps:

Clean surface: Wipe the control panel with a slightly damp cloth to remove sticky residues that may hinder button travel.
Access keypad: Remove the top or front cover to expose the user interface PCB and button contacts.
Inspect for damage: Look for cracks in the PCB or worn carbon pads on the buttons.
Check connector: Ensure the cable from the UI to the main board is secure.
Replace UI assembly: If buttons remain unreliable, replace the entire control panel / keypad assembly.

Buttons on the control panel are unresponsive or require very hard pressing.

Possible Causes