Daikin CMSQ200A7W1B Service Manual page 208

SiBE28-805
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
YES
not go off for 12 minutes
or more.
NO
Is
indoor - outdoor
and outdoor - outdoor unit
transmission wiring
normal?
YES
Disconnect
the outdoor-outdoor
unit transmission wiring, and
then check with a single
system whether or
not it
is normal.
YES
Troubleshooting by Indication on the Remote Controller
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 220~240 V
±10%.
YES
The fuse on
the outdoor unit's PC
board is burnt.
NO
NO
NO
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 indicated by the
malfunction code U4.
Fix the indoor/outdoor or
outdoor/outdoor unit
transmission wiring.
NO
Supply 220~240 V.
YES
Replace the fuse.
Replace the outdoor unit PC
board.
Push and hold the RESET
button on the outdoor unit PC
board for 5 seconds.
Fix the indoor/outdoor or
outdoor/outdoor unit
transmission wiring.
Replace the outdoor unit PC
Board (A1P).
Mount the DIII-NET extended
adaptor.
197