Panasonic CU-8ME1XPK - Malfunction of Transmission between Optional Controllers for Centralised Control

Troubleshooting (OP: Schedule Timer) PACD011001C2
550 Troubleshooting UM Combination “MA1R Series” Using R-407C
7.3 Malfunction of Transmission Between Optional Controllers for Centralised
Control
Remote Controller
Display
M8
Supposed Causes
„
Malfunction of transmission between optional controllers for centralised control
„
Defect of PC board of optional controllers for centralised control
Troubleshooting
(V1897)
Is
transmission wiring
disconnected or wired
incorrectly?
The PC board of one of the optional
controllers for centralised control is
defective. Try turning on/off using each
optional controllers for centralised
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
centralised control been
disconnected or
its address
changed?
Turn on power supply for all optional
controllers for centralised control.
Reset power supply simultaneously for
all optional controllers for centralised
control.
YES
NO
Is
the power supply
turned on for all optional
controllers for centralised
control?
Set reset switch to "normal".
YES
NO
Is
the reset switch
of all optional controllers for
centralised control
set to "normal" ?
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.