Daikin RXYQ96PYDN Service Manual page 435

Troubleshooting by Indication on the Remote Controller
Troubleshooting
420
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
NO
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
A
YES
Is indoor
- outdoor and outdoor -
NO
outdoor unit transmission
wiring normal?
NO
The
voltage between
NO
terminals L1 and N of the
outdoor unit PC board
is 208~230 V.
YES
The fuse on
the outdoor unit's PC
board is burnt.
NO
The
secondary voltage
of the transformer is
about 22 V.
YES
YES
NO
SiUS34-801A_b
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 208~230 V.
YES
Replace the fuse.
NO
Replace the transformer.
replacement
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.
(V2822)
Troubleshooting