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Haier AP242ACAAA Technical Manual page 47

Cabinet air conditioner
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9. Fault diagnosis
In the case of abnormal conditions, fault analysis shall be conducted referencing to the following table:
Fault coding
1. Indoor ambient temperature sensor
E1
get out of order, short circuit or
shutdown
2. Indoor computer plate L1 get out of
order
E2
1. Indoor coiled temperature sensor get
out of order, short circuit or shutdown
2. Indoor computer plate L1 get out of
order
E3
1. outdoor ambient temperature sensor get
out of order, short circuit or shutdown
2. outdoor computer plate L1 get out of
order
E4
1. outdoor coiled temperature sensor get
out of order, short circuit or shutdown
2. outdoor computer plate L1 get out of
order
E5
1. Compressor
protection point
2. Current transformer of outdoor
computer plate get out of order
3. Outdoor computer plate C11 get
out of order
1. Pressure switch of outdoor unit trip
E6
2. Pressure switch pin isn't well inserted
E7
1. Voltage is too low
2. Indoor computer plate R2 get out of
order
3. Indoor computer plate TV-01 get out
of order
E8
1. Connection between panel and main
plate isn't firm
2. Triode for communication between
panel and main plate get out of order
E9
1. Current of indoor and outdoor plate
L, N isn't correspondent.
2. Triode for communication of indoor
plate get out of order
3. Outdoor plate C18 is at fault
4. Outdoor plate optical coupler P521
get out of order
5. Outdoor plate optical coupler
TLP371 get out of order
Fault cause
current
exceed
Resolution
Replace
indoor
temperature sensor of computer
plate
Replace
indoor
temperature sensor of computer
plate
Replace
outdoor
temperature sensor of computer
plate
Replace
outdoor
temperature sensor of computer
plate
1. Remake current after power
fail
2. Replace outdoor computer
plate
Remake current after power-fail
1. Remake
current
power-fail
2. Replace indoor computer
plate
1. Remake current after
power-fail
2. Replace indoor computer
plate
3. Replace panel
1. Remake current after
power-fail
4. Replace outdoor computer
plate
37
Remarks
ambient
coiled
ambient
coiled
after

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