SiUS281117
Troubleshooting by Remote Controller
118
Service Diagnosis
2.12 Electronic Expansion Valve Coil Abnormality
Remote
Controller
Display
A9
Applicable
Models
All indoor models
Method of Error
Detection
Check the coil condition of electronic expansion valve by using micro-computer.
Error Decision
Conditions
Pin input for electronic expansion valve coil is abnormal when initializing micro-computer.
Supposed
Causes
Defective electronic expansion valve coil
Defective indoor unit PCB
Defective relay cable
Troubleshooting
The
electronic
expansion valve is connected
to X7A of the indoor
unit PCB.
Normal when
coil check (
∗
1) of the
electronic expansion valve
coil is checked.
The
relay cable is
short - circuited or
disconnected.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Caution
After connecting, turn the power
supply OFF and then back ON.
Replace the electronic expansion
valve coil.
Replace the relay cable.
If you turn the power supply OFF
and turn ON again, and it still does
not help, replace the indoor unit
PCB.
NO
YES
NO
YES
YES
NO