Part
6
-
Diagnosis and Troubleshooting
ODU power supply is abnormal or a
phase is missing
1
Provide normal power supply
Wires between outdoor main PCB, AC
filter boards and electric control box
power supply terminals are loose
Ensure the wires are connected properly
High voltage circuit error has occurred,
such as the compressor has malfunction
2
,
the fan motor has short-circuited
3
, or the
inverter module has short-circuited
4
Replace or repair the relevant parts
Replace the outdoor main PCB
Notes:
1. The normal voltage between A and N, B and N, and C and N is 198-242V.
2. The normal resistances of the inverter compressor are 0.05-0.15Ω among U V W and infinite between each of U V W and ground. If any of the resistances
differ from these specifications, the compressor has malfunction.
3. The normal resistances of the fan motor coil among U V W are less than 10Ω. If a measured resistance is 0Ω, the fan motor has short-circuited.
4. Set a multi-meter to buzzer mode and test any two terminals of P N U V W of the inverter module. If the buzzer sounds, the inverter module has short-
circuited.
Figure 6-2.1: Inverter module terminals
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