Trane TVR Pro CO Series Service Manual page 74

Procedure
Electronic expansion valve coil
connection on main PCB is loose
Electronic expansion valve coil has
Replace outdoor main PCB
Notes:
1. Electronic expansion valve coil connections is port CN70 on the main PCB (labeled 19 in Figure 5-2.1 in Part 5, 2.1 "Ports").
2. The normal resistances between EXV coil wiring terminals RED and white / yellow / orange / blue are 40-50Ω. If any of the resistances differ from the value,
the EXV coil has malfunctioned.
F6
No
malfunctioned
2
No
Figure: EXV coil wiring terminals
Yes
Ensure the sensor is connected properly
1
Yes
73
Replace the sensor