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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
7.3.7
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
Troubleshooting
* Caution Be sure to turn off power switch before connect or disconnect connector,
Check whether LED1 on
the outdoor unit blinks 1
times
the
indoor
damaged,
replacing with a new one
HSU24VHJ DB
temperatures
YES
NO
Indoor EEPROM error
Faulty EEPROM data
Faulty EEPROM
Faulty PCB
parts damage may be occurred.
NO
mainboard
is
and
needs
NO
The sensor is damaged. Replace the sensor
with a new one.
YES
The sensor is damaged. Replace the sensor
with a new one.
YES
The outdoor mainboard
is damaged. Replace it
with a new one.
59
Service Diagnosis
Domestic Air Conditioner
or
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