Daikin E-Series Service Manual page 404

SiAU18-715
Troubleshooting
NO
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
Caution 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?
NO
All indoor unit
remote controllers of the
same refrigerant system
display "U4."
YES
Reset the power supply.
Outdoor
unit PC board
microcomputer monitor
(HAP) blinks.
YES
Operation
ready lamp (H2P) is
blinking.
YES
Lamp does
not go off for 12 minutes
or more.
NO
Is
indoor - outdoor
and outdoor - outdoor unit
transmission wiring
normal?
YES
YES
Is indoor - outdoor
NO
and outdoor - outdoor unit
transmission wiring
normal?
NO
The
voltage
between terminals
NO
L1 and N of the outdoor
unit PC board is
220~240 V.
YES
The fuse on
the outdoor unit's PC
board is burnt.
NO
The secondary
voltage of the transformer
is about 22~24 V.
YES
YES
NO
Troubleshooting for Outdoor Unit
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
Replace the indoor unit
PC board.
Fix the indoor/outdoor unit
transmission wiring.
NO
Supply 220~240 V.
YES
Replace the fuse.
NO
Replace the transformer.
Replace outdoor unit PC
board (A1P).
Push and hold the RESET
button on the outdoor unit
PC board for 5 seconds.
Fix the indoor/outdoor unit
transmission wiring.
Replace the outdoor unit
PC board (A1P).
(Q0578)
391