York ductless or room AC remote control does not operate the unit

Safety: No high‑voltage work is required for basic checks, but unplug the unit before opening covers.

• Replace batteries: Install fresh batteries in the York remote and ensure correct polarity.
• Check IR path: Make sure nothing blocks the line of sight between remote and indoor unit receiver.
• Test remote: Point the remote at a smartphone camera; pressing buttons should show a flashing light on the screen. If not, replace the remote.
• Inspect IR receiver: If the remote works but the unit does not respond, the IR receiver board in the indoor unit may be faulty and should be replaced.