Service manual

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(V2821)
Replace K1M.
Repair wiring.
NO
NO
NO
Turn on again.
Replace the outdoor unit
PC board (A1P).
YES
YES
YES
Turn K1M ON.
YES
NO
Is 220 ~ 240 V of
power reaching the
K1M coil?
Is 220 ~ 240 V at
the connector X1A
of inverter PC
board.
Replace the inverter PC
board.
Replace the inverter PC
board.
YES
NO
NO
Does the voltage
between terminals P
and N gradually rise to
556 VDC (Y1) after
turning on?
Monitor field power
supply.
Replace the inverter
PC board.
The voltage
between the P and
N terminals is 380
VDC (Y1) or
morewhen the
compressor is
running.
Is connection wire
connected between
the connector X21A
and X6A?
YES
NO
Is 220 ~ 240 V at
the connector X1A
of outdoor PC
board side?
Check the transmission
wiring between the
outdoor unit PC board
and inverter unit.
YES
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.