Midea MHC-V4W/D2N8-B

M thermal Mono
90 200204
Midea M thermal Mono Service Manual
Notes:
1. If the fan motor is running and the DC voltage between terminals P and N on inverter module declined, Relay on the main control board of outdoor unit is
open.
2. When replacing an inverter module, a layer of thermally conductive silica gel should be painted on IPM module (on the reverse side of the inverter module
PCB). Refer to Figure 4-4.2.
Figure 4-4.4: Relay location of main PCB for refrigerant system
Single phase 4/6/8/10kW unit
Single phase 12/14/16kW unit
Relay
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
1
No
Replace the compressor
1. When replacing an inverter module, a layer of thermally conductive silica gel should be painted on IPM module (on the
reverse side of the inverter module PCB). Refer to Figure 4-4.2.
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