Electronic Expansion Valve Coil Abnormality - Daikin VRV RXYMQ-A Series Service Manual

SiME332106E

5.29 Electronic Expansion Valve Coil Abnormality

Applicable All outdoor unit models
Models
E9
Error Code
Method of Error
Detect according to whether or not there is continuity across the electronic expansion valve
Detection coils (Y1E, Y2E, Y3E, Y4E).
Error Decision
When no current flows through common (COM+) at the time of turning ON the power supply.
Conditions
Supposed  Disconnection of connectors from electronic expansion valves (Y1E, Y2E, Y3E, Y4E)
 Defective electronic expansion valve coil
Causes
 Defective outdoor unit main PCB
Troubleshooting
Reference
CHECK 18 Refer to page 288.
Part 6 Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Turn OFF the power supply
once, and then turn it ON again.
Return to normal?
NO
Is sub code one of
the following?
E9-48, 54
NO
Check for electronic
expansion valves applicable
to the error code E9 while in
monitor mode.
• Sub code
Y1E: E9-01
Y2E: E9-03
Y3E: E9-04
Y4E: E9-26
Connector for
the electronic expansion
valve of the outdoor unit main
PCB (A1P) is
connected.
YES
CHECK 18
The resistance of the
electronic expansion
valve coil is
normal.
YES
YES
CHECK 18
The resistance of
YES
the electronic expansion
valve coil is
normal.
YES
NO
NO
Troubleshooting by Error Code
Investigate external causes other than
failures (e.g. noise).
NO
Replace the defective electronic
expansion valve coil.
Replace the outdoor unit main PCB
(A1P).
Properly and securely connect the
connector.
Replace the electronic expansion
valve coil.
Replace the outdoor unit main PCB
(A1P).
205