Daikin VRV - WII, Service Manual

Page: 198 / 312

SiUS30-604 Troubleshooting by Indication on the Remote Controller
Troubleshooting 185
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Clogged
water piping
system (mixing in
of foreign particles,
solenoid valve
for water
use)
Replace the main PCB.
YES
NO
YES
Secure enough water.
Remove the clog.
NO
The
output voltage
among three phases is
within ±5V of power
supply.
NO
Replace the inverter PCB.
Are
characteristics of
the thermistor on the heat
exchanger gas side (R4T) and
the low pressure sensor
(S1NPL) normal?
(
∗
1)
NO
Replace the thermistor/sensor if
any of its characteristics are
abnormal.
Is
the heat exchanger
dirty?
YES
Clean the heat exchanger.
YES
NO
Is the
connection
between the thermistor
on the heat exchanger gas side
(R4T) and the low pressure
sensor (S1NPL)
proper?
Disconnect the connection between
the compressor and the inverter and
turn on the power transistor check
mode setting using “Setting Mode 2”
on the outside PCB.
Measure the output voltage of
the inverter.
Note: Take measurements
while frequency is stable.
NO
Connect the connector properly.
YES
Is the
amount of water
of heat exchanger
50 l/minute
or more?
∗
1 : For thermistor/sensor characteristics, refer to page 278, 279.
∗
2 : The quality of the power transistor diode module can be assessed by means of
measurement of resistance between terminals (page 281, 282).
(*2)