Daikin REYQ-AATJA, Service Manual

Page: 370 / 495

Troubleshooting by Error Code SiUS372201EA
363 Part 6 Service Diagnosis
3.47 Branch Selector Unit Electronic Expansion Valve
Abnormality
Applicable
Models
Branch Selector unit
Error Code
F9
Method of Error
Detection
The error is detected by whether or not all coils of the electronic expansion valve have continuity.
Error Decision
Conditions
The power supply turns ON, but there is no currents pass through the common (COM[+]).
Supposed
Causes
 Disconnection of the electronic expansion valve connector

Defective electronic expansion valve coil
 Defective PCB of Branch Selector unit
Troubleshooting
While in monitor mode,
identify an electronic
expansion valve subject to
the Error Code
F9 . ( 1)
Identify the electronic
expansion valve coil to be
checked based on the table.
(
2)
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
YES
Return to normal?
Turn power supply OFF, and
turn power supply ON again.
Replace the electronic
expansion valve coil.
Replace the Branch
Selector unit PCB.
YES
YES
NO
Ensure the correct
connection.
External factor other than
error (for example, noise
etc.).
NO
NO
The connector
of outdoor unit main PCB
for electronic expansion
valve is connected.
The coil
resistance of electronic
expansion valve is normal.
CHECK 18