Troubleshooting by Indication on the Remote Controller
SiUS30-1301
168
Service Diagnosis
Electronic Expansion Valve Coil Abnormality
Error Code
A9
Applicable
Models
Indoor units except FXFQ models
Method of Error
Detection
Check 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 of electronic expansion valve coil
Defective PCB indoor unit
Defective relay cables
Troubleshooting
NO
YES
YES
Electronic
expansion valve is
connected to X7A of
indoor unit
PCB.
NO
YES
Coil
check of
electronic expansion
valve drive indicates
normal.
NO
Relay
cables short
circuit or
disconnected.
When restarting the operation
after shutting the power supply
OFF does not work, replace the
indoor unit PCB.
Replace the relay cables.
Shut the power supply OFF
after connection and then
restart.
Replace the electronic
expansion valve coil.
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
CHECK 9
CHECK 9