Daikin REYQ-AATJA, Service Manual, Page: 360 / 495

Troubleshooting by Error Code SiUS372201EA
353 Part 6 Service Diagnosis
Reference
3.40 Electronic Expansion Valve Coil Abnormality or Sub PCB
Momentary Overcurrent
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
 Sub PCB momentary overcurrent
Troubleshooting
CHECK 18 Refer to page 444.
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
is connected.
Properly and securely connect the
connector.
NO
YES
Replace the electronic expansion
valve.
NO
Replace the outdoor unit main PCB
(A1P).
NO
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
E9-01/05: Y1E (Master / Sub)
E9-03/06: Y2E (Master / Sub)
E9-04/07: Y3E (Master / Sub)
E9-26/27: Y4E (Master / Sub)
E9-29/34: Y5E (Master / Sub)
E9-11/12: Y6E (Master / Sub)
E9-30/35: Y7E (Master / Sub)
E9-31/36: Y8E (Master / Sub)
E9-57/58: Y6E, Y7E, Y8E (Master/Sub)
The
resistance of the
electronic expansion
valve coil is normal.
CHECK 18
YES
Replace the outdoor unit sub PCB
(A8P).
YES
Is the error code
E9-57/58?