Electronic Expansion Valve Coil Abnormality / Dust Clogging - Daikin VRV-WIII RWEYQ72PTJU Service Manual

SiUS30-1301
3.7 Electronic Expansion Valve Coil Abnormality / Dust
Clogging
A9
Error Code
Applicable
FXFQ
Models
Method of Error
Check coil condition of electronic expansion valve by using micro-computer.
Check dust clogging condition of electronic expansion valve main body by using micro-computer.
Detection
Error Decision Pin input for electronic expansion valve coil is abnormal when initializing micro-computer.
Conditions Either of the following conditions is seen/caused/ occurs while the unit stops operation.
 Temperature of suction air (R1T) – temperature of liquid pipe of heat exchanger (R2T) > 46.4°F.
 Temperature of liquid pipe of heat exchanger (R2T) shows fixed degrees or below.
 Defective of electronic expansion valve coil
Supposed
 Defective PCB indoor unit
Causes
 Defective relay cables
Troubleshooting
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
When power
is supplied.
YES
Electronic
expansion valve is
connected to X7A of
indoor unit
PCB.
YES
Coil
check of
electronic expansion
valve drive indicates
normal.
CHECK 9
YES
Relay
cables short circuit
or disconnected.
NO
CHECK 9 Refer to P.249.
Troubleshooting by Indication on the Remote Controller
NO
NO
NO
YES
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 PCB.
167