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
Содержание RXSQ24TAVJU
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