Trane 4TVH0086FE000AA Service Manual page 93

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 are port CN70, CN71 and CN72 on the main PCB (labeled 18, 19 and 20, respectively, 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.
xF6
No
malfunctioned
2
No
Figure 6-2.3: EXV coil wiring terminals
Yes
Ensure the sensor is connected properly
1
Yes
92
Replace the sensor