Models: KSIM20912-H216, KSIM30912-H216, KSIM40912-H216 Diagnosis and Solution: EEPROM parameter error diagnosis and solution (E0/F4): Malfunction decision conditions: Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip. Supposed causes: Installation mistake. PCB faulty . Indoor / outdoor unit’s communication diagnosis and solution (E1): Malfunction decision conditions: Indoor unit does not receive the