Buttons on the control panel stick or require excessive force to operate.

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

• 1. Clean surface: Wipe the control panel with a damp cloth to remove sticky residues.
• 2. Inspect overlay: Remove the bezel and check for warped or damaged overlays that may be causing buttons to bind. Replace if necessary.
• 3. Check switches: For mechanical buttons, test each switch for smooth operation and continuity. Replace the user interface board if the switches are failing.