Remote control does not operate the unit (for models with IR remote).

Safety: No internal work required for basic checks; unplug before opening the control panel.

Steps:

• Batteries: Replace the remote control batteries with fresh ones, observing polarity.
• Line of sight: Ensure there is a clear path between the remote and the IR receiver window on the unit.
• Test remote: Point the remote at a smartphone camera; you should see the IR LED flash on the screen when pressing buttons. If not, replace the remote control.
• Receiver: If the remote works but the unit does not respond, the IR receiver module on the display PCB may be faulty and should be replaced or the entire display PCB changed.