Heater display is on but buttons do not respond or respond intermittently.

Safety first: Turn off power before removing the front control panel.

• Dry the panel: If the heater is exposed to rain or splash, gently dry the keypad area and check for cracks in the overlay.
• Reseat ribbon cable: Carefully unplug and replug the ribbon cable between the keypad and control board.
• Test operation: Restore power and test button response. If still intermittent, the keypad or UI board likely needs replacement.