Daikin VRV-WIII RWEYQ72PTJU Service Manual page 228

Troubleshooting by Indication on the Remote Controller
Troubleshooting
220
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Check
if indoor
unit PCB or
condensing unit PCB
has been replaced. Or
check if indoor-condensing,
condensing-condensing
transmission wires
have been
modified.
NO
Do all
the indoor
remote controllers NO
within the same
refrigerant circuit
display
U4
" "?
YES
Reset the power supply.
Does the
normal
condition monitor for
NO
the micro-computer (HAP)
on the condensing
unit PCB
blink?
YES
Does the
LED in
NO
preparation mode (H2P)
on the condensing
unit PCB
blink?
YES
Lights
YES
do not go out
for 12 minutes or
more.
NO
Are the
indoor-condensing,
NO
condensing-condensing
transmission wires
normal?
YES
YES
Are the
indoor-condensing,
condensing-condensing
transmission wires
normal?
NO
Is the
voltage between
R, S terminals on the
condensing unit PCB 208V
or 230V?
YES
Is the fuse
on the condensing
unit PCB blown?
NO
230V units?
YES
The
secondary
voltage of the
transformer is about 20V.
(only for 230V
units)
YES
SiUS30-1301
Press the RESET button on the
master condensing unit main PCB.
Keep pressing for 5 seconds or
more. (Operation does not start
for a maximum 12 minutes.)
YES
Replace the indoor unit PCB.
Correct the transmission wires.
NO
Correct the power supply voltage.
YES
Replace the fuse.
NO
Replace the condensing unit PCB
(A1P).
NO
Replace the transformer.
Replace the condensing unit PCB
(A1P).
Press the RESET button on the
condensing unit main PCB. Keep
pressing for 5 seconds or more.
Correct the transmission wires.
Replace the condensing unit main
PCB.
Service Diagnosis