Remote control does not operate the air conditioner or only works at very close range.

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

Steps:

• Replace batteries: Install fresh, high-quality batteries in the remote, observing correct polarity.
• Clear line of sight: Ensure there are no objects blocking the IR window on the front of the unit.
• Test remote: Point the remote at a smartphone camera and press buttons; you should see the IR LED flash on the camera screen. If not, the remote is likely faulty.
• Inspect IR receiver: If the remote works but the unit does not respond, the IR receiver board or main control board may be defective and require replacement.