Daikin FXYBP20K7V1, Service Manual

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Troubleshooting (OP: Central Remote Controller) SiE 00-07
168 Troubleshooting R-407C PLUS Series
6.2 PC Board Defect
Remote Controller
Display
M1
Supposed Causes Defect of central remote controller PC board
Troubleshooting
Replace the central remote controller PC board.
6.3 Malfunction of Transmission Between Optional Controllers for Centralized
Control
Remote Controller
Display
M8
Supposed Causes
Malfunction of transmission between optional controllers for centralized control
Defect of PC board of optional controllers for centralized control
Troubleshooting
(VF072)
Is
transmission wiring
disconnected or wired
incorrectly?
The PC board of one of the optional
controllers for centralized control is
defective. Try turning on/off using each
optional controllers for centralized
control, and replace the PC board of
the one that is unable to control the
indoor unit.
NO
NO
Fix the wiring correctly.
YES
YES
Has a once
connected optional
controller for centralized
control been disconnected
or its address
changed?
Turn on power supply for all optional
controllers for centralized control.
Reset power supply simultaneously for
all optional controllers for centralized
control.
YES
NO
Is
the power supply
turned on for all optional
controllers for
centralized control?
Set reset switch to "normal."
YES
NO
Is
the reset switch
of all optional controllers
for centralized control set to
''normal?''