Signal Transmission Error (Between Indoor And Outdoor Units) - Daikin FTKE25BVM Service Manual

Si12-411A
5.8 Signal Transmission Error (between Indoor and Outdoor
Units)
U4
Remote
Controller
Display
Method of The data received from the outdoor unit in indoor unit-outdoor unit signal transmission is
checked whether it is normal.
Malfunction
Detection
Malfunction When the data sent from the outdoor unit cannot be received normally, or when the content of
the data is abnormal.
Decision
Conditions
Supposed
Causes
Troubleshooting
Check No.10
Refer to P.212
Service Diagnosis
Faulty outdoor unit PCB.
Faulty indoor unit PCB.
Indoor unit-outdoor unit signal transmission error due to wiring error.
Indoor unit-outdoor unit signal transmission error due to disturbed power supply waveform.
Indoor unit-outdoor unit signal transmission error due to breaking of wire in the connection
wires between the indoor and outdoor units (wire No. 2).
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Check the indoor unit-outdoor unit
connection wires.
Is there any wiring error?
NO
Check the outdoor unit's LED A.
Is LED A flashing?
YES
Check the voltage of the indoor
unit-outdoor unit connection wires
between No. 1 and No. 2, and
between No 2 and No. 3.
Is the voltage 0 V?
NO
Check No. 10
Check power supply waveform.
Is there any disturbance?
YES
YES
NO
YES
NO
Troubleshooting
Correct the indoor unit-outdoor
unit connection wires.
Diagnose the outdoor unit.
Replace the connection wires
between the indoor and
outdoor units.
Replace indoor unit control
PCB .
Locate the cause of the
disturbance of the power supply
waveform, and correct it.
(R2840)
179