Haier HSU-18,22HVA103/R2(DB) Service Manual page 84

the results deviate
much?
The outdoor mainboard is damaged and needs be
replaced
7.2.7
The EEPROM Abnormality (Indoor or outdoor unit)
Indoor Display
Method of the Data detected by the EEPROM are used to determine MCU
Malfunction
Detection
when the Data of EEPROM is error or the EEPROM is damaged
Malfunction
Decision
Conditions
Supposed ■ Faulty EEPROM data
■ Faulty EEPROM
Causes
■ Faulty PCB
* Caution Be sure to turn off power switch before connect or disconnect connector,
Troubleshooting
Check whether LED1 on
the outdoor unit blinks 1
times
the indoor
damaged,
replacing with a new one
HSU-18,22HVA103/R2(DB)
NO
NO
E4: ：Indoor EEPROM error
F12：Outdoor EEPROM error
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.
83
Service Diagnosis
or
Domestic Air Conditioner