Haier HSM18HEKC03/R2 Service Manual page 64

the results deviate
much?
The outdoor mainboard is damaged and
needs be replaced
7.3.7
The EEPROM Abnormality (Indoor or outdoor unit)
Indoor Display E4:
F12 Outdoor EEPROM error
Method of the Data detected by the EEPROM are used to determine MCU
Malfunction
Detection
Malfunction when the Data of EEPROM is error or the EEPROM is damaged
Decision
Conditions
Supposed
Causes
Faulty PCB
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector, or
Check whether LED1 on
the outdoor unit blinks 1
times
the indoor
damaged,
replacing with a new one
HSM18HEKC/HRAC03/R2(DB)HUM18HC03/R2(DB)-SM
YES
NO
Indoor EEPROM error
Faulty EEPROM data
Faulty EEPROM
parts damage may be occurred.
NO
mainboard is
and needs
YES
The sensor is damaged. Replace the sensor
with a new one.
YES
The outdoor mainboard
is damaged. Replace it
with a new one.
62
Service Diagnosis
Domestic Air Conditioner