Daikin REYQ72-432XAYCU, Service Manual

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SiUS371901EB Troubleshooting by Error Code
Part 6 Service Diagnosis 344
Reference
3.38 Electronic Expansion Valve Coil Abnormality
Applicable
Models
All outdoor unit models
Error Code
E9
Method of Error
Detection
Detects 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
CHECK 18 Refer to page 439.
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