Sinclair SCV-750EB Service Manual page 128

Procedure
Electronic expansion valve coil
connection on main PCB is loose
Electronic expansion valve coil has
Replace outdoor main PCB
Notes:
1. For SCV-750EB and SCV-1400EB, electronic expansion valve coil connections are port CN70, CN71 and CN72 on the main PCB (labeled 31, 32, 30 in Part 4,
2.2.1 Main PCB component). For SCV-900EB and SCV-1800EB, electronic expansion valve coil connections are port CN70, CN71 and CN72 on the main PCB
(labeled 22, 20, 21 in Part 4, 2.2.1 Main PCB component).
2. The normal resistances between EXV coil wiring terminals is 40-50Ω. If any of the resistances differ from the value, the EXV coil has malfunctioned.
126
HE
1
No
malfunctioned 2
No
Yes
Ensure the sensor is connected properly
Yes
Replace the EXV