Electronic Expansion Valve Coil Abnormality, Dust Clogging - Daikin RXYQ-TA Series Service Manual

SiUS341615E
3.13 Electronic Expansion Valve Coil Abnormality, Dust
Clogging
A9
Error Code
Applicable All indoor unit models
Models
Method of Error Check coil condition of electronic expansion valve by using microcomputer.
Detection Check dust clogging condition of electronic expansion valve main body by using microcomputer.
Error Decision
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.
Conditions
R1T: temperature of suction air
R2T: temperature of liquid pipe of heat exchanger
Supposed
Causes
Troubleshooting
CHECK 18
Service Diagnosis
R1T – R2T > 8°C (14.4°F)
R2T shows fixed degrees or below.
Defective electronic expansion valve coil
Defective indoor unit main PCB
Defective relay cables
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Power is
supplied.
YES
Electronic
expansion valve is
connected to X7A of
indoor unit
PCB.
YES
Check
of electronic
expansion valve coil
indicates normal.
CHECK 18
YES
Relay
cables short circuit
or disconnected.
NO
Refer to page 305.
NO
NO
NO
YES
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 main PCB (A1P).
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