Signal Transmission Error (Between Indoor Unit And Outdoor Unit) - Daikin 3MKS50E3V1B Service Manual

Troubleshooting for RA Indoor Unit - FTXG, FTXS, CTXS, FVXG, FVXS, FLXS, FDXS Series
5.7 Signal Transmission Error (between Indoor Unit and
Outdoor Unit)
U4
Remote
Controller
Display
Method of
The data received from the outdoor unit in indoor unit-outdoor unit signal transmission is
Malfunction checked whether it is normal.
Detection
Malfunction The data sent from the outdoor unit cannot be received normally, or the content of the data is
Decision abnormal.
Conditions
Supposed
Causes
Troubleshooting
Check No.11
Refer to P.328
282
Wiring error
Breaking of the connection wires between the indoor and outdoor units (wire No. 3)
Defective outdoor unit PCB
Defective indoor unit PCB
Disturbed power supply waveform
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Check the indoor unit - outdoor
unit connection wires.
Is there any wiring error?
NO
Check the voltage of the indoor
unit-outdoor unit connection wires
between No. 1 and No. 3, and
between No. 2 and No. 3.
Properly insulated?
NO
Check the LED A on the outdoor
unit PCB.
Is LED A blinking?
YES
Check No.11
Check the power supply
waveform.
Is there any disturbance?
YES
YES
YES
NO
NO
SiBE121135
Correct the indoor unit -
outdoor unit connection wires.
Replace the connection wires
between the indoor unit and
the outdoor unit.
Diagnose the outdoor unit
PCB.
Replace the indoor unit PCB.
Locate the cause of the
disturbance of the power
supply waveform, and correct
it.
Service Diagnosis
(R15782)