E4 - Indoor EEPROM error

What does E4 mean?

The indoor unit displays E4, indicating an error with the indoor unit's EEPROM, which stores essential operating data.

• Corrupted data in the EEPROM chip
• Faulty EEPROM chip
• Temporary power surge or instability
• Indoor unit PCB issue

Click steps to track your progress.

1. 1

   Turn off the AC unit from the main power supply for at least 10 minutes, then power it back on.

2. 2

   Check your home's electrical panel for any tripped circuit breakers related to the AC unit and reset if necessary.

3. 3

   If the error reappears, professional service is required to diagnose or replace the indoor PCB.