AUKS AL-H18/4DR1(U), Service Manual

Page: 116 / 161

AUKS DC Inverter 1 Drive1 50HZ R410A Trouble shooting
116
6. Failure code display
When AC has failure,outdoor control board
、
indoor digital tube and wire controller will display error
codes.
Indoor unit error code:
Error
code
Error code definition
Recovery
or not
Problem possible reasons
A1
Indoor ambient
temperature sensor
failure
Yes
Indoor PCB is broken
The fuse of indoor PCB is broken
temperature sensor broken , or exceed test limit
A2
Temperature sensor
about middle position
of evaporator failure
Yes
Indoor PCB is broken
The fuse of indoor PCB is broken
temperature sensor broken , or exceed test limit
A5
Indoor water pump
failure
Yes
Water pump no power
Water pump switch short-circuit or unconnected
Water pump is broken
Drain pipe block or up lean
Indoor PCB is broken
A8
Indoor unit ERRPROM
module failure
No
Indoor unit PCB is broken
Error module is broken.
A9
The communication
between indoor unit
and outdoor unit failed
No
The communication wire between indoor unit and
outdoor unit is broken.
Indoor unit power close
Indoor PCB is broken
AA
The communication
between indoor unit
and wire controller
failed
No
The communication wire between indoor unit
and outdoor unit is broken.
Indoor unit power close
Indoor PCB is broken
Wire controller is broken
Outdoor unit error code:
Error
code
Error code
definition
Recovery
or not
Problem possible reasons
C1
Ambient
temperature sensor
“Tao”failure
Yes
Temperature sensor failure or test temperature exceed
limit.
Sensor connection is incorrect.
Outdoor unit PCB failure.
C2
Defrosting
temperature sensor
“Tdef” failure
Yes
Temperature sensor failure or test temperature exceed
limit.
Sensor connection is incorrect.
Outdoor unit PCB failure.
C3
Discharge
temperature of
inverter compressor
"Td" failure
Yes
Temperature sensor failure or test temperature exceed
limit.
Sensor connection is incorrect.
Outdoor unit PCB failure.