Indoor unit displays E0 and the air conditioner does not respond to remote commands or buttons.

Safety first: Turn off the AC using the isolator switch or circuit breaker and wait at least 5 minutes before removing any covers. Risk of electric shock even when switched off due to stored charge in capacitors.

Steps to try:

• Power reset: Turn the AC off at the breaker for 10–15 minutes, then restore power. Sometimes the EEPROM error clears after a full reset.
• Check indoor front panel: Remove the front fascia (if accessible) and verify the display PCB ribbon cable is firmly seated on the indoor main PCB. Reseat the connector.
• Inspect for surge damage: Look for burn marks, swollen components, or a burnt smell on the indoor main PCB. If present, the board must be replaced.
• EEPROM/PCB replacement: If E0 persists, the indoor main control board (with EEPROM) typically needs replacement. Match the Bosch model number and PCB part number exactly. This job involves disconnecting multiple harnesses; take photos before removal.

When to call a technician: If you are not comfortable working around electronics or if the PCB shows visible damage, contact an authorized Bosch service technician for board replacement and configuration.