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Compact 4-Way Cassette Indoor Unit
Error
Content
Code
L5
Freeze protection
No Master Indoor Unit
L7
Error
Power Insufficiency
L8
Protection
Quantity Of Group
L9
Control Indoor Units
Setting Error
db
8 Troubleshooting
The air conditioner is not expected to be serviced by users. Incorrect repair may cause electric
shock or fire, so please contact an authorized service center for professional service. The following
checks prior to contact may save your time and money.
Phenomenon
The unit can't start.
The unit stops after
running for a while.
Poor cooling effect.
Poor heating effect.
Indoor fan doesn't
start up during
heating.
Note:
If air conditioner still fails to work normally after checking and handling as described above,
please stop using it immediately and contact local service center for assistance.
Error
Code
d4
d6
d7
d8
Special Code: Field Debugging Code
① Power supply is not connected.
② Circuit breaker tripping caused by leakage of electricity.
③ Input voltage is too low.
④ Operation button is closed.
⑤ Control loop is abnormal
① The inlet or outlet of ODU or IDU are blocked by obstacle.
② Control loop is abnormal
③ Set the unit in cooling mode when outdoor ambient T is higher than 43℃(109
① The filter is dirty or blocked.
② Too heavy heat load of room (e.g. too many people).
③ Door or windows is open.
④ Inlet and outlet of IDU are blocked.
⑤ Setting temperature is too high or refrigerant leaks.
⑥ The performance of room temperature sensor is getting worse.
① The filter is dirty or blocked.
② Door or window is open.
③ Setting temperature is too low.
④ Refrigerant leakage.
⑤ Outdoor ambient temperature is lower than -5℃(23
⑥ Abnormality of control circuit.
① Placing position of tube temperature sensor head is not suitable.
② Tube temperature sensor head isn't inserted well.
③ Wiring of tube temperature sensor head is broken.
④ Capacitor is leaking electricity.
Content
Inlet Pipe Temperature
Sensor Error
Outlet Pipe
Temperature Sensor
Error
Humidity Sensor Error
Water Temperature
Error
Troubleshooting
21
Error
Content
Code
Indoor Unit CO
2
dE
Error
Water Temperature
dy
Sensor Error
C0
Communication Error
Filter Cleaning
AJ
Reminder
o
F).
Sensor
o
F).
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