Service Manual

SiUS281811E Troubleshooting by Error Codes
Part 6 Service Diagnosis 207
4.19 Transmission Abnormality (between Indoor Unit PCB and
Fan PCB)
Error Code C1
Applicable
Models
FBQ-P
Method of Error
Detection
Transmission conditions between the indoor unit main PCB (A1P) and fan PCB (A2P) are checked
via microcomputer.
Error Decision
Conditions
Normal transmission is not carried out for a certain duration.
Supposed
Causes
 Defective connection of the connector between indoor unit main PCB (A1P) and fan PCB (A2P)
 Defective indoor unit main PCB (A1P)
 Defective fan PCB (A2P)
 External factor, such as instantaneous power failure
Troubleshooting
NO
Is the
connector between
indoor unit PCB (A1P) and fan
PCB (A2P) accurately
connected? (1)
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Connect the connector accurately.
NO
Under
above field setting mode,
second code
No. is 01.
Replace the indoor unit main
PCB (A1P).
NO
YES
YES
YES
Replace the fan PCB (A2P).
Continue the operation (It is
possible to have a cause, such
as instantaneous power failure).
Connect the connector X70A
and turn ON the power again.
C1
Reoccurrence
of error.
Confirm the condition of
transmission on indoor unit
PCB using field setting mode.
(2)