Haier HSU12 - The EEPROM Abnormality (Indoor or Outdoor Unit)

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Domestic Air Conditioner
YES
NO
7.3.7 The EEPROM Abnormality (Indoor or outdoor unit)
Indoor Display E4: ˖Indoor EEPROM error
F12˖Outdoor EEPROM error
Method of the Data detected by the EEPROM are used to determine MCU
Malfunction
Detection
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Malfunction when the Data of EEPROM is error or the EEPROM is damaged
Decision
Conditions
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Supposed
Ƶ
Faulty EEPROM data
Causes
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Faulty EEPROM
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Faulty PCB
Troubleshooting
* Caution Be sure to turn off power switch before connect or disconnect connector, or
parts damage may be occurred.
YES
NO
Pull out the exhaust sensor and measure its
resistance at standard temperatures
according to the resistance-temperature table
NO
The sensor is damaged. Replace the sensor
with a new one.
the results deviate
much?
YES
The sensor is damaged. Replace the sensor
with a new one.
The outdoor mainboard is damaged and
needs be re
p
laced
Check whether LED1 on
the outdoor unit blinks 1
times
The outdoor mainboard
is damaged. Replace i
t
with a new one.
the indoor mainboard is
damaged, and needs
replacing with a new one
HSU12/18VHJ(DB)
Functions and control
63