Panasonic CU-8ME1XPK - Outdoor Unit: Malfunction of Transmission between Inverter and Control PC Board; Outdoor Unit: Malfunction of Transmission; Between Inverter and Control PC Board

PACD011001C2 Troubleshooting (Inverter)
Troubleshooting UM Combination “MA1R Series” Using R-407C 539
5.5 Outdoor Unit: Malfunction of Transmission Between Inverter and Control PC
Board
Remote Controller
Display
LC
Supposed Causes
„
Malfunction of connection between the inverter unit and outdoor unit PC board
„
Defect of outdoor unit PC board (transmission section)
„
Defect of inverter unit
„
Defect of noise filter (NF1)
„
Open phase on power supply during outdoor unit operation
„
External factor (Noise etc.)
Troubleshooting
(VF067)
The
transmission
wiring between the
outdoor unit PC board, sub board
and inverter unit is
disconnected.
YES
Fix the disconnection and turn on
again.
Connect transmission wiring and turn
on again.
NO
YES
The
microcomputer
monitor (green) on
the inverter unit
is blinking.
The voltage
between red and
white of CN on the inverter
unit is 220 ~ 240 V
(50Hz)
NO
Defect of outdoor PC board or defect of
inverter unit
Check the noise filter (Z1F) for
disconnection, and check the power
supply wiring or the inverter unit.
Replace inverter PC board.
When the "LC" malfunction occur
again, replace control PC board.
YES
The
microcomputer
monitor (green) on
sub board is
blinking.
NO
Check the sub board power and the
connector tightness.
YES
NO
YES
NO
Are X3A on
the outdoor unit PC
board, sub board and X3A on
the inverterunit connected
securely.
YES
Fix the power supply.
NO
Are the
power supply
voltage between each
phase right?
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.