Service Manual

SiUS281811E Troubleshooting by Error Codes
Part 6 Service Diagnosis 203
4.16 Electronic Expansion Valve Coil Abnormality, Dust
Clogging
Error Code A9
Applicable
Models
All indoor models
Method of Error
Detection
Electronic expansion valve coil conditions are checked via microcomputer.
The electronic expansion valve main body is checked for dust clogging via microcomputer.
Error Decision
Conditions
Pin input for electronic expansion valve coil is abnormal when initializing microcomputer.
Either of the following conditions is seen/caused/occurs while the unit stops operation.
 R1T – R2T > 8°C (14.4°F)
 R2T shows fixed degrees or below.
R1T: temperature of suction air
R2T: temperature of liquid pipe of heat exchanger.
Supposed
Causes
 Defective electronic expansion valve coil
 Defective indoor unit main PCB
 Defective relay cables