Fisher FSKIF-121AE2-EU Service Manual page 142

Troubleshooting
2.4.4 For the outdoor unit
2.4.4.1. F4 malfunction
F4
E0 display
Outdoor EEPROM malfunction
Power off, then restart the unit 2
minutes later
Yes
Replace the outdoor main PCB
EEPROM: An electrically erasable programmable read-only memory whose contents can be erased and
reprogrammed using a pulsed voltage.
138 Electrical Control System