M thermal Split
86 202004
Midea M thermal Split
Situation 2: L0 or L4 error appears immediately after the compressor starts up
L0 / L4
U V W wire between i
compressor is not connected properly
1
Yes
Ensure U V W wire is connected properly
No
Inverter module is damaged
2
Yes
Replace the inverter module
3
No
Compressor has malfunctioned
4
Yes
Replace the compressor
No
Replace the outdoor unit main PCB
Notes:
1. Connect the U V W wire from the inverter module to the correct compressor terminals, as indicated by the labels on the compressor.
2. Measure the resistance between each of U, V and W and each of P and N on the inverter module. All the resistances should be infinite. If any of them are
not infinite, the inverter module is damaged and should be replaced. Refer to
Figure 4-2.5 to 4-2.7 in Part 4, 2.1 Main PCBs for Refrigerant System,
Inverter Module
3. When replacing an inverter module, a layer of thermally conductive silica gel should be painted on the IPM module, IGBT, diode brigde rectifer (on the
reverse side of the inverter module PCB). Refer to Figure 4-4.2.
4. The normal resistances of the inverter compressor are 0.7-
differ from these specifications, the compressor has malfunctioned.
Midea CAC
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