The indoor unit has power but will not respond to remote control commands.

Steps:

• Replace batteries: Install fresh, high-quality batteries in the Bosch remote control, observing polarity.
• Check IR path: Ensure there is a clear line of sight between the remote control and the indoor unit's IR receiver. Clean the receiver window with a soft cloth.
• Test remote: Point the remote control at a smartphone camera and press a button; you should see the IR LED flash on the camera screen. If not, the remote control may be faulty.
• Use manual controls: Try starting the unit using the manual ON/OFF button on the indoor unit (if provided). If this works, the IR receiver or the remote control is at fault.

Resolution: Replace the Bosch remote control or the IR receiver board as needed.