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24.2.3 E04 - Error in Indoor Unit Receiving Signal from Outdoor Unit
Wiring/Power Supply issue:
No communication from outdoor unit within 3 minutes or no signal from outdoor unit
o Outdoor Unit main power supply turned OFF.
o No proper set for indoor unit resistance impedance terminal (CN045)
o Communication cable is lose/opened/improper install.
Setting Related:
CHK and TEST pin shorted.
EEPROM no installed or defect when main power switched ON.
Outdoor unit main PCB malfunction.
Wrongly set the indoor unit address (duplicated)
DISP Pin
CHK Pin
EEPROM
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