Specifications

SiBE18-821 Troubleshooting for Outdoor Unit
Troubleshooting 335
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
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 controllers of the
same refrigerant system
display "U4."
Is
indoor - outdoor
and outdoor - outdoor unit
transmission wiring
normal?
Outdoor
unit PC board
microcomputer monitor
(HAP) blinks.
Reset the power supply.
Is indoor - outdoor
and outdoor - outdoor unit
transmission wiring
normal?
The
voltage
between terminals
L1 and N of the outdoor
unit PC board is
220~240 V.
The fuse on
the outdoor unit's PC
board is burnt.
The secondary
voltage of the transformer
is about 22~24 V.
Operation
ready lamp (H2P) is
blinking.
Lamp does
not go off for 12 minutes
or more.
NO
Fix the indoor/outdoor unit
transmission wiring.
NO
Push and hold the RESET
button on the outdoor unit
PC board for 5 seconds.
YES
NO
Replace the indoor unit
PC board.
Supply 220~240 V.
Fix the indoor/outdoor unit
transmission wiring.
Push and hold the RESET
button on the master
outdoor unit PC Board for
5 seconds.
∗ The unit will not operate
for up to 12 minutes.
YES
YES NO
Replace outdoor unit PC
board (A1P).
YES
NO
NO
YES
YES
Replace the outdoor unit
PC board (A1P).
YES
(Q0578)
YES
NO NO
Replace the fuse.
NO
YES
YES
Replace the transformer.
NO