Rheem ductless remote control does not operate the indoor unit, but unit works from manual controls.

Safety first: No high-voltage work is needed for basic checks, but turn off power if removing indoor covers.

• Replace batteries: Install fresh, correct-type batteries in the Rheem remote. Ensure polarity is correct.
• Test remote: Point the remote at a smartphone camera and press a button; you should see the IR LED flash on the camera screen. If not, the remote is faulty.
• Check receiver window: Clean the IR receiver window on the indoor unit with a soft cloth.
• Receiver board: If the remote works but the unit does not respond, the IR receiver board or indoor PCB may be faulty and require replacement.

Warning: Avoid static discharge when handling indoor electronic boards.