Remote control does not operate Klarstein air conditioner; unit works from panel buttons.

Safety: No high-voltage work is required for basic checks, but unplug the unit before opening the control panel.

Steps:

• Replace batteries: Install fresh, correctly oriented batteries in the remote.
• Check IR signal: Point the remote at a smartphone camera and press buttons; you should see a flashing light on the remote’s LED through the camera.
• Clear line of sight: Ensure nothing blocks the IR receiver window on the unit and clean it with a soft cloth.
• Receiver board: If the remote works (as seen via camera) but the unit does not respond, the IR receiver board or its connection to the main PCB may be faulty. Access the control panel, reseat the IR receiver connector, and replace the IR receiver module if necessary.