Daikin VRVII - Page 108

Troubleshooting by Indication on the Remote Controller
103
Troubleshooting
Note:
∗1.
Make measurement of voltage of the pressure sensor.
Refer to P.372.
Measure
the voltage
(VL) of connector
pin No. (2) - (3) of
outdoor unit PCB. (∗1)
Is the relationship
between low
voltage and VL
normal?
Low
pressure at stop
due to error is
abnormal.
Is stop valve
opened?
YES
NO
NO
YES
NO
Refrigerant
shortage,
refrigerant
system clogging,
wiring and piping
wrong
connection, stop
valve closed,
electronic
expansion valve
fully close error.
YES
Replace the low
pressure sensor.
Replace the
outdoor unit
PCB.
Open stop valve.
Caution
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
may be damaged.
Outdoor unit PCB
Micro-computer
A/D input
+5V
Connector for
low pressure
sensor (Blue)
GND
CHECK 12
Red
Black
White
Low pressure sensor
Make measurement of DC voltage
between these wires.
CHECK 12