Trane 4TVH0086FE000AA Service Manual page 81

Procedure
ODU power supply is abnormal or a
Wires between outdoor main PCB, AC
filter boards and electric control box
power supply terminals are loose
High voltage circuit error has occurred,
such as the compressor has
malfunctioned
circuited
Replace outdoor main PCB
Notes:
1. The normal resistances of the inverter compressor are 0.7-1.5Ω 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 malfunctioned.
2. 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.
3. Set a multi-meter to buzzer mode and test any two terminals of P U V W of the inverter module. If the buzzer sounds, the inverter module has short-circuited.
E5
phase is missing 1
No
No
2 , the fan motor has short-
3 , or the inverter module has
short-circuited
4
No
Figure 6-2.1: Inverter module terminals
U V W
Yes
Provide normal power supply
Yes
Ensure the wires are connected properly
Yes
Replace or repair the relevant parts
P
80