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Lennox VRF Air Handler Indoor Unit
7 Table of Error Codes for Indoor Unit
Error
Content
Code
L0
Indoor Unit Error
Indoor Fan
L1
Protection
L2
E-heater Protection
Water Full
L3
Protection
Wired Controller
L4
Power Supply
Error
Anti-Frosting
L5
Protection
No Master Indoor
L7
Unit Error
Power Insufficiency
L8
Protection
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
Content
Code
Quantity Of Group Control
L9
Indoor Units Setting Error
Indoor Units Incompatibility
LA
Error
LH
Low Air Quanlity Warning
Outdoor-Indoor
LC
Incompatibility Error
d1
Indoor Unit PC-Board Error
Ambient Temperature
d3
Sensor Error
Inlet Pipe Temperature
d4
Sensor Error
Outlet Pipe Temperature
d6
Sensor Error
① Power supply is not connected.
② Circuit breaker tripping caused by leakage of electricity.
③ Input voltage is too low.
④ Defect of main PC-board.
① The inlet or outlet of ODU or IDU are blocked by obstacle.
① The filter is dirty.
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.
⑥ Refrigerant is insufficient (e.g. refrigerant leakage)
① The filter is dirty.
② Door or window is open.
③ Setting temperature is too low.
④ Refrigerant is insufficient (e.g. refrigerant leakage)
① At starting, the IDU fan could not operate till the heat exchange become hot,
for preventing delivering the cool air.
② At defrosting, the IDU fan stopped due to system switch to cooling mode. For
preventing delivering the cool air, and resume operating after defrosting.
18
Error
Code
Water Temperature Sensor
d8
Error
d9
Jumper Cap Error
Indoor Unit
dA
Hardware Address Error
Wired Controller PC-Board
dH
Error
Capacity DIP Switch Setting
dC
Error.
Outlet Air Temperature
dL
Sensor Error
Indoor Unit CO
dE
Error
Special Code:
db
Field Debugging Code
Troubleshooting
Content
Sensor
2
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