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

Troubleshooting (Inverter) PACD011001C2
386 Troubleshooting Urban Multi “MX1R, ME1R Series” Using R-407C
5.5 Outdoor Unit: Malfunction of Transmission between Inverter and Control PC
Board
Remote Controller
Display
LC
LCLC
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 (Z1F)
Troubleshooting
(VF067)
The
transmission
wiring between the
outdoor unit PC 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),
220 V (60Hz).
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 the inverter unit.
When the "LC" malfunction occur
again, replace the outdoor unit PC
board.
YES
NO
YES
NO
Are X3A
on the outdoor unit PC
board and X3A on the inverter
unit connected
securely.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.