Daikin REYQ-XA, Service Manual

Page: 317 / 441

SiUS371901E Troubleshooting by Error Code
Service Diagnosis 304
3.38 Electronic Expansion Valve Coil Abnormality
Error Code
E9
Applicable
Models
All outdoor unit models
Method of Error
Detection
Detect according to whether or not there is continuity across the electronic expansion valve coils.
Error Decision
Conditions
When no current flows through common (COM[+]) at the time of turning ON the power supply.
Supposed
Causes
„
Disconnection of connectors from electronic expansion valves
„
Defective electronic expansion valve coil
„
Defective outdoor unit main PCB
Troubleshooting
Refer to page 393.
Turn OFF the power supply
once, and then turn it ON again.
Return to normal?
Investigate external causes other than
failures (e.g. noise).
YES
NO
Connector
for the electronic
expansion valve of the
outdoor unit main PCB
(A1P) is connected.
Properly and securely connect the
connector.
NO
YES
Replace the electronic expansion
valve.
NO
Replace the outdoor unit main PCB
(A1P).
YES
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Check for electronic expansion valves applicable to the error code E9 while in monitor mode.
Sub code
E09-01/05/08: Y1E (master / slave 1 / slave 2)
E09-03/06/09: Y2E (master / slave 1 / slave 2)
E09-04/07/10: Y3E (master / slave 1 / slave 2)
E09-26/27/28: Y4E (master / slave 1 / slave 2)
E09-29/34/39: Y5E (master / slave 1 / slave 2)
E09-32/37/42: Y7E (master / slave 1 / slave 2)
The
resistance of
the electronic
expansion valve coil is
normal.
CHECK 18
CHECK 18