PCB EEPROM DATA FAULT OR FAILURE OF MCU READING EEPROM DATA.
REPAIR:
1) SWITCH OFF THE POWER, THEN SWITCH IT BACK ON. IF THE FAULT REMAINS, IT IS NEEDED TO CHECK IF THE INDOOR EEPROM INSTALLATION IS LOOSE OR IMPROPER:
SOLUTION 1) IF YES, PLEASE INSTALL AGAIN
2) SWITCH OFF THE POWER, THEN SWITCH IT BACK ON. IF THE FAULT REMAINS, IT IS NEEDED TO CHECK IF THE OUTDOOR EEPROM INSTALLATION IS LOOSE OR IMPROPER:
SOLUTION 2) IF YES, PLEASE INSTALL AGAIN
3) IF THE INSTALLATION IS GOOD, CHECK WHETHER THERE IS A COMPONENT(S) PSEUDO SOLDERING ON BOARD:
SOLUTION 3) PLEASE SOLDER AGAIN IF NECESSARY
4) IF THE FAULT REMAINS UNSOLVED AFTER REPLACEMENT OF THE INDOOR CONTROL BOARD:
SOLUTION 4) TEST OUTDOOR UNIT PCB OR REPLACE IT IF NECESSARY
5) CHECK UP THE CHECKSUM ON OUTDOOR PCB — EEPROM (IC3), IT SHOULD CORRESPOND TO THE CHECKSUM ON CONTROL BOX:
SOLUTION 5) IF THEY DO NOT CORRESPOND, PLEASE REPLACE THE OUTDOOR PCB
6) IF THE PROBLEM STILL REMAINS AFTER ALL INSPECTIONS, PLEASE REPLACE THE EEPROM