Lennox VRF VECC007C432P, Installation Manual, Page: 26 / 28

21
Error
Code
Content
Error
Code
Content
Error
Code
Content
L5 Freeze protection d4
Inlet Pipe Temperature
Sensor Error
dE
Indoor Unit CO
2
Sensor
Error
L7
No Master Indoor Unit
Error
d6
Outlet Pipe
Temperature Sensor
Error
dy
Water Temperature
Sensor Error
L8
Power Insufficiency
Protection
d7 Humidity Sensor Error C0 Communication Error
L9
Quantity Of Group
Control Indoor Units
Setting Error
d8
Water Temperature
Error
AJ
Filter Cleaning
Reminder
db Special Code: Field Debugging Code
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 Troubleshooting
The unit can’t start.
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
The unit stops after
running for a while.
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
o
F)
.
Poor cooling effect.
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.
Poor heating effect.
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 o F)
.
⑥
Abnormality of control circuit.
Indoor fan doesn’t
start up during
heating.
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.
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.
Compact 4-Way Cassette Indoor Unit