Indoor unit displays temperature but does not respond to remote commands

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

• Test remote: Use a smartphone camera to confirm the remote's IR LED flashes when buttons are pressed.
• Reduce interference: Shade the indoor unit from direct sunlight and move strong light sources away.
• Replace batteries: Install new batteries in the remote.
• Replace receiver: If the remote works but the unit never responds, replace the IR receiver board in the indoor unit.