Remote control does not operate the unit, but indoor display lights are on.

Safety first: No high-voltage work is needed for basic checks, but turn off power before opening the indoor panel.

• Step 1 – Replace batteries: Install new, high-quality batteries in the Ariston remote, ensuring correct polarity.
• Step 2 – Test remote output: Point the remote at a smartphone camera and press buttons; look for flashing light on the screen. If none, replace the remote.
• Step 3 – Clear IR window: Clean the IR receiver window on the indoor unit with a soft cloth and ensure no objects block the line of sight.
• Step 4 – Check IR receiver board: If the remote works but the unit does not respond, open the front panel and check the IR receiver board connection. Replace the IR receiver if necessary.