Ariston water heater shows E14; unit may not respond to user input or buttons.

Safety first: Disconnect power before removing the front panel.

• Dry and clean panel: If the heater is installed in a humid area, check for condensation inside the front cover. Gently dry with a cloth and allow time for moisture to evaporate.
• Inspect keypad: Look for signs of physical damage or stuck buttons. Gently press each button to ensure free movement.
• Reseat ribbon cable: Disconnect and reconnect the ribbon cable between the display/keypad board and the main control board.
• Replace UI board: If buttons remain unresponsive or E14 persists, replace the user interface/display PCB with an Ariston-compatible part.

After replacement, reassemble the cover and restore power. Reconfigure settings as needed.