Daikin VRV - WII, Service Manual

Page: 191 / 312

Troubleshooting by Indication on the Remote Controller SiUS30-604
178 Troubleshooting
Troubleshooting
YES
NO
NO
YES
YES
NO
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Is the
UVWN wire connection
proper?
Is it a
high differential
pressure at the time of
start-up (72.5psi or
more)?
(
∗
1)
Restart operation after
resetting operation.
Disconnect the connection between
the compressor and the inverter
and turn on power transistor check
mode setting using “Setting Mode
2” on the outside unit PCB.
Measure inverter output voltage.
Note: Take measurements
while frequency is stable.
Eliminate the causes.
The hot gas bypass valve
may not be opened.
Check it.
NO
YES
The inverter
compressor operates
normally.
Replace the compressor.
NO
Replace the inverter PCB.
YES
Replace the inverter compressor.
Open the stop valve.
∗
1 : Difference in pressure between high and low pressures before start-up
∗
2 : The quality of the power transistor diode module can be assessed also by means of
measurement of resistance between terminals (page 281, 282).
Is the stop
valve opened?
Connect properly.
Inverter
output voltage
among 3 phases is
within ±5V of power
supply.