Display lights up but buttons do not respond or respond intermittently.

Safety: Unplug the unit before removing the control panel.

Steps to restore button response:

• Surface cleaning: Wipe the control panel with a slightly damp cloth and mild detergent, then dry thoroughly. Do not allow liquid to seep into the edges.
• Power reset: Unplug for 5–10 minutes, then plug back in and test. Sometimes the touch controller can lock up.
• Access panel: Remove screws securing the top/front housing to expose the touch panel and ribbon cable.
• Check ribbon cable: Ensure the flat cable is fully seated in both the touch panel and main PCB connectors. Reseat it carefully.
• Inspect panel: Look for cracks in the plastic overlay or signs of moisture ingress. If the panel is physically damaged or still unresponsive, replace the touch control panel assembly.

Note: Avoid using harsh cleaners or spraying liquid directly on the control panel; this can cause recurring keypad issues.