Daikin VRV - WII Service Manual page 198

SiUS30-604
Troubleshooting
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Clogged
water piping
system (mixing in
of foreign particles,
solenoid valve
for water
use)
NO
Is the
amount of water
of heat exchanger
50 l/minute
or more?
YES
Is
the heat exchanger
dirty?
NO
Is the
connection
between the thermistor
on the heat exchanger gas side
(R4T) and the low pressure
sensor (S1NPL)
proper?
YES
Are
characteristics of
the thermistor on the heat
exchanger gas side (R4T) and
the low pressure sensor
(S1NPL) normal?
(∗1)
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.
(*2)
Note: Take measurements
while frequency is stable.
The
output voltage
among three phases is
within ±5V of power
supply.
YES
∗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).
Troubleshooting by Indication on the Remote Controller
YES
NO
YES
NO
NO
NO
Remove the clog.
Secure enough water.
Clean the heat exchanger.
Connect the connector properly.
Replace the thermistor/sensor if
any of its characteristics are
abnormal.
Replace the inverter PCB.
Replace the main PCB.
185