Service manual

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(V2822)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Is indoor -
outdoor and
outdoor - outdoor
unit transmission
wiring normal?
Supply 220~240 V.
Replace the fuse.
Fix the indoor/outdoor unit
transmission wiring.
Push and hold the RESET
button on the outdoor unit PC
board for 5 seconds.
Replace the outdoor unit PC
Board (A1P).
YES
YES
NO
YES
Replace the indoor unit PC
Board.
Push and hold the RESET butt
o
on the master outdoor unit PC
Board for 5 seconds.
* The unit will not operate for
up to 12 minutes.
Fix the indoor/outdoor unit
transmission wiring.
YES
NO
NO
YES
Has the indoor or
outdoor unit PC board
been replaced, or has
the indoor - outdoor or
outdoor - outdoor unit
transmission wiring
been modified?
All indoor unit
remote controls of
the same refrigerant
system display
"U4."
NO
Outdoor unit PC board
microcomputer monitor
(HAP) blinks.
NO
NO
NO
Operation ready lamp
(H2P) is blinking.
Lamp does not go
off for 12 minutes
or more.
Is indoor -
outdoor and outdoor -
outdoor unit transmission
wiring normal?
YES
The fuse on the
outdoor unit's PC
board is burnt.
Replace the transformer.
replacement
Replace outdoor unit PC
board. (A1P)
NO
The secondary
voltage of the
transformer is about
22 V.
NO
The voltage between
terminals L1 and N of the
outdoor unit PC board is
220~240 V.
Reset the power supply.
YES
YES
YES
NO
YES