The Eeprom Abnormality (Outdoor Unit) - Haier HSU-18HEA03/R2(DB)-I Service Manual

Pull out the exhaust sensor and measure its
resistance at standard
according to the resistance-temperature table
the results deviate
much?
The outdoor mainboard is damaged and
needs be replaced

7.3.8 The EEPROM Abnormality (outdoor unit)

outdoor display
Method of
Malfunction the Data detected by the EEPROM are used to determine MCU
Detection
Malfunction when the Data of EEPROM is error or the EEPROM is damaged
Decision
Conditions
Supposed
Causes
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector,
HSU-18HEA03/R2(DB)-I
temperatures
NO
NO
LED1 flash 1 times
Faulty EEPROM data
Faulty EEPROM
Faulty PCB
parts damage may be occurred.
The outdoor mainboard is damaged and
needs be replaced
YES
The sensor is damaged. Replace the sensor
with a new one.
YES
The sensor is damaged. Replace the sensor
with a new one.
67
Service Diagnosis
or
Domestic air conditioner