Outdoor Unit: Malfunction Of Transmission Between Inverter And Control Pc Board; Outdoor Unit: Malfunction Of Transmission; Between Inverter And Control Pc Board - Panasonic Urban Multi MX1R Series Service Manual

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