Midea ATOM MDV-V56WDHN1(AtB) - Page 80

Atom B Series VRF 50/60Hz
79
Part
6
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Diagnosis and Troubleshooting
2.23 L0/L1/L2/L4/L5/L7/L8/L9: L category of inverter module protection (For all models)
2.23.1 Digital display output
L0/L1/L2/L4/L5/L7/L8/L9
2.23.2 Description
 Compressor inverter module protection.
 The system stops running.
 Error code is displayed on the outdoor unit PCB.
2.23.3 Trigger / recover condition
 Trigger condition: Inverter module or compressor is abnormal.
 Recover condition: Inverter module and compressor goes back to normal.
 Reset method: Manually restart.
2.23.4 Possible causes
 Power supply is abnormal.
 Refrigerant cooling module is abnormal.
 Compressor is abnormal.
 Outdoor unit main control board damaged.
2.23.5 L0/L4: Procedure
L0 / L4
U V W wires between inverter module
and compressor is not connected
properly
Yes
Ensure U V W wire is connected properly
No
Whether refrigerant cooling pipe
assemble properly
No
Reinstallation to confirm refrigerant
cooling pipe contact with radiator tightly
Yes
Replace the main control board to check
whether the fault is occur again
Yes
Exclude whether system is abnormal
and compressor has any abnormal noise
No
Replace the compressor