Lennox MPA009S4S-1P - E0 Fault Code

Lennox Mini-Split Service Manual / Page 143
E0 Fault Code
Basic Description:
Outdoor EEPROM malfunction.
General Note:
PCB main chip does not receive feedback from EEPROM chip. EEPROM: a read-only
memory whose contents can be erased and reprogrammed using a pulsed voltage.
For the location of EEPROM chip, please refer to the below photos.