Transmission Abnormality Between Indoor Unit Control Pcb And Fan Pcb - Daikin REYQ-XA Service Manual

SiUS371901E
3.19 Transmission Abnormality between Indoor Unit Control
PCB and Fan PCB
C1
Error Code
Applicable
FXSQ-TA, FXMQ-PB
Models
Method of Error Transmission conditions between the indoor unit control PCB (A1P) and fan PCB (A2P) are
checked via microcomputer.
Detection
Error Decision When normal transmission is not conducted for certain duration.
Conditions
Supposed
Causes
Troubleshooting
Service Diagnosis
Connection defective the connector between indoor unit control PCB (A1P) and fan PCB (A2P)
Defective indoor unit control PCB (A1P)
Defective fan PCB (A2P)
External factor, such as instantaneous power failure
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Is the
connector
between indoor
unit control PCB
(A1P) and fan PCB
(A2P) accurately
connected?
(∗1)
YES
Confirm the condition of
transmission on indoor
unit control PCB using
field setting mode. (∗2)
Under
above field
setting mode, second
code No. is
01.
YES
Connect the connector
X70A and turn ON the
power again.
C1 is
displayed
again.
NO
NO
NO
YES
Troubleshooting by Error Code
Connect the connector
accurately.
Replace the indoor unit control
PCB (A1P).
Replace the fan PCB (A2P).
Connect it and continue the
operation (It is possible to have
a cause, such as instantaneous
power failure).
274