Electronic Expansion Valve Coil Abnormality, Dust Clogging - Daikin VRV S RXQ4/5ARV1 Service Manual

SiAF332111E
5.9 Electronic Expansion Valve Coil Abnormality, Dust
Clogging
Applicable All indoor unit models
Models
A9, A9-02
Error Code
Method of Error Electronic expansion valve coil conditions are checked via microcomputer.
Detection The electronic expansion valve main body is checked for dust clogging via microcomputer.
Error Decision
Pin input for electronic expansion valve coil is abnormal when initializing microcomputer.
Conditions Either of the following conditions is seen/caused/occurs while the unit stops operation.
 Temperature of suction air (R1T) – temperature of liquid pipe (R2T) > 8°C.
 Temperature of liquid pipe of heat exchanger (R2T) shows fixed degrees or below.
Supposed
 Defective electronic expansion valve coil
Causes  Defective indoor unit control PCB
 Defective relay cables
Troubleshooting
Reference
CHECK 18 Refer to page 358.
Part 6 Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
NO
Power is supplied.
YES
Electronic expansion
NO
valve is connected to
X5A/X7A of indoor
unit PCB.
YES
CHECK 18
Check of electronic
NO
expansion valve coil
indicates normal.
YES
Relay cables short
YES
circuit or
disconnected.
NO
Troubleshooting by Error Code
Replace the electronic expansion
valve main body.
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 control PCB (A1P).
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