The F4 error in Carrier AC indicates an outdoor unit EEPROM error, meaning there is a problem with the Electrically Erasable Programmable Read-Only Memory (EEPROM) in the outdoor unit’s PCB (Printed Circuit Board). The EEPROM stores critical system settings and calibration data for the air conditioner, and if it malfunctions, the system will not be able to function correctly. When the F4 error is triggered, it typically means that the EEPROM has become corrupted, is not readable, or has failed altogether. This error can occur due to various reasons, such as electrical surges, component failure, or aging of the circuit board. Since the EEPROM is essential for controlling various settings and operations of the unit, its malfunction can severely impact the AC’s functionality. In most cases, the F4 error requires PCB replacement, as the EEPROM is usually integrated into the circuit board. Once the faulty PCB is replaced, the system will reset and return to normal operation. To prevent this error, it’s important to avoid power surges and ensure the air conditioner’s electrical components are protected. Regular maintenance, including checking the condition of the PCB and the overall electrical system, can help avoid issues related to EEPROM failure and ensure the longevity of the Carrier AC unit.

Meaning

Outdoor Unit EEPROM Error, Need PCB Replacement