Daikin VRVIII-S Service Manual page 181

Troubleshooting by Indication on the remote control
Troubleshooting
∗
170
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
controls of the same
refrigerant system
display"U4."
YES
Reset the power supply.
Outdoor unit PC
boardmicrocomputer
monitor(HAP) blinks.
YES
Has either
the fuse F4U on the
outdoor unit PC board (A1P)
or the fuse F1U on the inverter PC
board (A2P) blown out?
Operation ready
lamp (H2P) is
blinking.
YES
YES
Lamp does not go
off for 12 minutes or
more.
NO
Is
indoor -
outdoor and outdoor -
outdoor unit transmission
wiring normal?
YES
Check No.3 : Refer to information on P.195.
YES
Is indoor -
outdoor and outdoor
NO
- outdoor unit transmission
wiring normal?
NO
Are
there any broken
wires in the connectors of the
NO
inverter PC board (A1P) and the control PC
board (A2P)?
YES
The voltage between
terminals L3 and N of the
outdoor unit PC board is
220~240 V.
YES
The fuse F3U on the
NO
outdoor unit's PC board
is burnt.
Check No. 3
YES
Check for the fan motor
connector.
Is resistance
between pins in
NO
excess of judgment
criteria?
YES
NO
SiENBE34-703
Push and hold the RESET
button on the master outdoor
unit PC Board for 5 seconds.
∗ The unit will not operate
forup to 12 minutes.
YES
Replace the indoor unit PC
board.
Fix the indoor/outdoor unit
transmission wiring.
NO
Repair the broken wires, and
then restart operation.
NO
Supply 220~240 V.
YES
Replace the fuse.
∗
NO
Replace the fuse F4U and
the inverter PC board (A2P).
Replace the fan motor.
Replace the inverter PC
board.
Replace the fuse F4U.
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).
Troubleshooting
(V3187)