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Troubleshooting by Error Code
SiUS331708EA
179
Service Diagnosis
4.15 Electronic Expansion Valve Coil Abnormality, Dust
Clogging
Error Code
A9
Applicable
Models
All indoor units
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.
z
R1T – R2T > 8°C (14.4°F)
z
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
Troubleshooting
NO
NO
NO
YES
YES
Shut the power supply OFF after
connection and then restart.
Replace the electronic expansion
valve coil.
Replace the relay cables.
When restarting the operation after
shutting the power supply OFF
does not work, replace the indoor
unit main PCB (A1P).
NO
Replace the electronic expansion
valve main body.
Power is supplied.
YES
YES
Electronic
expansion valve is
connected to X7A
of indoor unit
PCB.
Relay cables short
circuit or
disconnected.
Check
of electronic
expansion valve coil
indicates normal.
CHECK 18
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
CHECK 18
Summary of Contents for RXSQ24TAVJU
Page 1: ...Service Manual SiUS331708EA RXSQ24 36 48 60TAVJU Heat Pump 60 Hz...
Page 290: ...Wiring Diagrams SiUS331708EA 277 Appendix RXSQ48TAVJU 3D109546A...
Page 291: ...SiUS331708EA Wiring Diagrams Appendix 278 RXSQ60TAVJU 3D109547A...
Page 295: ...SiUS331708EA Wiring Diagrams Appendix 282 FXZQ05 07 09 12 15 18TAVJU 3D110443A...
Page 298: ...Wiring Diagrams SiUS331708EA 285 Appendix FXEQ07 09 12 15 18 24PVJU 3D098557A...
Page 300: ...Wiring Diagrams SiUS331708EA 287 Appendix FXSQ05 07 09 12 15 18 24 30 36 48 54TAVJU 3D110467B...
Page 301: ...SiUS331708EA Wiring Diagrams Appendix 288 FXMQ07 09 12 15 18 24 30 36 48 54PBVJU 3D093209B...
Page 302: ...Wiring Diagrams SiUS331708EA 289 Appendix FXHQ12 24 36MVJU 3D048116C...
Page 303: ...SiUS331708EA Wiring Diagrams Appendix 290 FXAQ07 09 12 18 24PVJU 3D075354C...
Page 309: ...SiUS331708EA Wiring Diagrams Appendix 296 VAM1200GVJU 3D073270D...