Lc" Outdoor Unit: Malfunction Of Transmission Between Inverter And Control P.c.b - Daikin FCQ18PVJU Service Manual

Troubleshooting by Indication on the Remote Controller
LC
3.33 " " Outdoor Unit: Malfunction of Transmission
between Inverter and Control P.C.B.
LC
Remote
Controller
Display
Applicable RZQ18~30PVJU
Models
Method of
Check the communication state between inverter P.C.B. and control P.C.B. by micro-computer.
Malfunction
Detection
Malfunction
When the correct communication is not conducted in certain period.
Decision
Conditions
 Malfunction of connection between the inverter microcomputer and outdoor control
Supposed
Causes
 Defect of outdoor unit P.C.B.
 Defect of noise filter
 External factor (Noise etc.)
Troubleshooting
127
microcomputer
Be sure to turn off the power switch before connecting or disconnecting
Caution
the connector, or parts could be damaged.
Is the
connector for the
fan motor properly
connected to the indoor
unit P.C.B.?
YES
Disconnect the connection for
the fan motor, and turn on
again.
E7
Is " "
displayed on the remote
LC
controller? (not " ")
NO
NO
YES
SiUS28-902_a
Connect correctly.
Replace the fan motor.
Failure of the inverter
transmission occurs due to the
fan motor malfunction.
Replace the outdoor unit P.C.B.
(A1P).
Troubleshooting