Daikin RQYQ140-180PY1 Service Manual page 124

Troubleshooting by Remote Controller
Troubleshooting
Micro-controller
115
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Is the stop
valve open?
(1) Mount a pressure gauge on the low pressure
service port.
(2) Reset the operation using the remote
controller, and then restart the operation.
Are the
characteristics of
the low pressure
sensor normal?
(See *1.)
Service Checker
Connect the service checker to compare the "low pressure"
value and the actual measurement value by pressure
sensor (Refer to *1) by using the service checker.
Check if the "low
pressure" value and
the actual
measurement value
by pressure sensor
are the same.
· The low pressure sensor is normal, and the pressure
detected with the PCB is also normal.
· The low pressure has really become low.
Referring to information on P.190, remove the
CHECK 2
causes by which the low pressure has become low.
*1: Make a comparison between the voltage of the pressure sensor and that read by the
pressure gauge.
(As to the voltage of the pressure sensor, make measurement of voltage at the connector,
and then convert it to pressure according to information on P.201.)
*2: Make measurement of voltage of the pressure sensor.
A/D input
Make measurement of DC voltage between these wires.
NO
YES
NO
YES
NO
YES
+5V
Connector for low pressure sensor
(Blue)
(4)
(3)
(2)
(1)
SiBE341001
Open the stop valve.
Replace the low pressure sensor.
Replace the main PCB (A1P).
Red
Black
Low
pressure
sensor
White
Troubleshooting