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9. Maintenance
9.1 Error Code
Display Method
No.
Malfunction
of Indoor Unit
Name
(Error Code)
Indoor ambient
temperature
1
sensor is open/
short-circuited
Indoor
evaporator
2
temperature
sensor is open/
short-circuited
Blocked
3
protection of
IDU fan motor
Malfunction
4
protection of
jumper cap
Overload
5
malfunction
Zero-crossing
inspection
circuit
6
malfunction
of the IDU fan
motor
30
A/C Status
The unit will stop operation as it
reaches the temperature point.
During cooling and drying operation,
F1
except IDU fan motor operates,
other loads stop operation; During
heating operation, the system stops
operation.
The unit will stop operation as it
reaches the temperature point.
During cooling and drying
F2
operation, except IDU fan operates,
other loads stop operation; During
heating operation, the complete
unit stops operation.
IDU fan, ODU fan, compressor and
electric heat tube stop operation.
H6
Horizontal louver stops at the
current position.
Operation of remote controller or
C5
control panel is available, but the
unit won't act.
E8
The entire unit stops.
Operation of remote controller or
U8
control panel is available, but the
unit won't act.
Possible Causes(For specific maintenance method,
please refer to the following procedure of
troubleshooting)
1.The wiring terminal between indoor ambient temperature
sensor and main board is loosened or poorly contacted;
2.There's short circuit due to trip-over of the parts on
controller;
3.Indoor ambient temperature sensor is damaged (Please
check it by referring to the resistance table for temperature
sensor)
4. Main board is broken.
1.The wiring terminal between indoor evaporator
temperature sensor and main board is loosened or poorly
contacted;
2.There's short circuit due to the trip-over of the parts on
controller;
3.Indoor evaporator temperature sensor is damaged
(Please check it by referring to the resistance table for
temperature sensor)
4. Main board is broken.
1.The feedback terminal of PG motor is not connected
tightly.
2.The control terminal of PG motor is not connected
tightly.
3.Fan blade rotates unsmoothly.
4.Malfunction of motor
5.Main board is broken.
1.There's not jumper cap on the main board.
2.Jumper cap is not inserted properly and tightly.
3.Jumper cap is damaged.
4.Controller is damaged.
1.Indoor and outdoor heat exchanger is too dirty?
Or air inlet/outlet is blocked?
2.Fan motor is not working. Abnormal fan speed; fan
speed is too low or the fan doesn't run.
3.Compressor operates normally or not? Is there any
abnormal noise or oil leak? Casing is too hot?
4.System is blocked inside? (Dirt blockage? Ice blockage?
Oil blockage? Y-valve is not fully open?)
5.Main board temperature sensor detects wrongly.
1.Quick de-energization and energization. Wrong
judgement by the controller because the electric-
discharging of capacitor is slow.
2.Zero-crossing inspection circuit of main board for
controller is abnormal.
Service Manual
Installation and Maintenance
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