Pc Board Defect; Malfunction Of Transmission Between Optional Controllers For Centralized Control - Daikin VRV R-407C PLUS Series Service Manual

Troubleshooting (OP: Schedule Timer)
7.2

PC Board Defect

M1
Remote Controller
Display
Supposed Causes
Troubleshooting
7.3 Malfunction of Transmission Between Optional Controllers for Centralized
Control
M8
Remote Controller
Display
Supposed Causes
Troubleshooting
172
Defect of schedule timer PC board
Reset power supply.
Does the system return to
normal?
NO

Malfunction of transmission between optional controllers for centralized control

Defect of PC board of optional controllers for centralized control
Has a
once connected
optional controller for
centralized control been
disconnected or
its address
changed?
NO
Is
the power supply
turned on for all optional
controllers for centralized
control?
YES
Is
the reset switch
of all optional controllers for
centralized control
set to "normal" ?
YES
Is
transmission wiring
disconnected or wired
incorrectly?
YES
YES
YES
NO
NO
NO
External factor other than
equipment malfunction (noise
etc.)
Replace the indoor unit PC
board.
(V0843)
Reset power supply simultaneously for
all optional controllers for centralized
control.
Turn on power supply for all optional
controllers for centralized control.
Set reset switch to "normal."
Fix the wiring correctly.
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.
Troubleshooting R-407C PLUS Series
SiE 00-07
(VF076)