Midea MHC-V16W/D2RN8-B - L4 troubleshooting

M thermal Mono
202004 99
L4 troubleshooting(the same as L1/L2)
Situation 1: L4 error appears immediately after the outdoor unit is powered-on
L4
Replace the inverter PCB
Condition 2: L4 error appears after the compressor has been running for a period of time and the compressor speed is
over 60rps
L4
Compressor is over-current
2
Yes
Replace the compressor
No
Replace the inverter PCB
Notes:
1. Re-start the unit, use clip-on ammeter to measure the compressor current, if the current is normal indicates the compressor is failed, if the current is
abnormal indicates the inverter PCB is failed..
L5/L8/L9 troubleshooting
L5/L8/L9
The wire is not connected properly
NO
Ensure wire is connected properly
Yes
Inverter module PCB has malfunctioned
Yes
Replace inverter module PCB
No
Replace the compressor
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