Remote control does not operate the indoor unit

Safety first: No high-voltage work is required for basic checks.

Steps to check:

• 1. Replace batteries: Install fresh, correctly oriented batteries in the remote.
• 2. Check IR transmission: Point the remote at a smartphone camera and press a button; you should see a flashing light on the remote's IR LED through the camera.
• 3. Clear line of sight: Ensure there is no obstruction between the remote and the indoor unit's IR receiver window.
• 4. Try manual controls: Use the ON/OFF button on the indoor unit (if present). If manual control works but remote does not, the remote or IR receiver is suspect.

When to call a technician: If a new remote does not solve the issue, the IR receiver board or indoor PCB may need replacement.