Daikin VRV RXYMQ-A Series, Руководство по обслуживанию

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SiME332106E Troubleshooting by Error Code
Part 6 Service Diagnosis 175
Reference
5.9 Electronic Expansion Valve Coil Abnormality, Dust
Clogging
Applicable
Models
All indoor unit models
Error Code
A9, A9-02
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.
 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
Causes

Defective electronic expansion valve coil
 Defective indoor unit control PCB
 Defective relay cables
Troubleshooting
CHECK 18 Refer to page 288.
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 control PCB (A1P).
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
CHECK 18
Check of electronic
expansion valve coil
indicates normal.
Relay cables short
circuit or
disconnected.
NO
Replace the electronic expansion
valve main body. Power is supplied.
YES
YES
Electronic expansion
valve is connected to
X5A/X7A of indoor
unit PCB.