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Procedure
H6 / HH
Strong wind is blowing towards the fan, making
the fan running in the wrong direction
No
DC fan wire is loosed
No
The fan motor is blocked or has failed
No
Inverter module is damaged
No
Replace outdoor unit main PCB
Notes:
1.
Refer to Figures 4‐1.1 to 4‐1.6 in Part 4, 1.1 "Outdoor Unit Electric Control Box Layout" and to the M‐Thermal Split Engineering Data Book, Part 2, 5 "Wiring
Diagrams".
2.
Only applies to single‐phase power supply models. Check the voltage between "+" and "‐" terminals on the PFC module on the inverter module. The
normal range is 277V to 354V. If the voltage is outside this range, the PFC module is damaged.
P N VCC 5 6
1 3 4 5 6
3.
Measure the voltage between the DC fan motor power supply's white and black wires. The normal voltage is 15V when the unit is in standby. If the voltage
is significantly different from 15V, the IPM module on the inverter module is damaged. The DC fan connection CN19 on the inverter module labelled 5 in
Figure 4‐2.2 in Part4, 2.3 "Main PCBs for Refrigerant System, Inverter Module"
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1
2
Midea CAC Confidential
Change the outdoor unit's installation direction or
Yes
build a shelter to protect the fan from strong wind
Yes
Reconnect DC fan wire
Yes
Remove obstruction or replace the fan motor
Yes
Replace Inverter module
M‐Thermal Split
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