Daikin RMXS-L Series Service Manual page 196

Troubleshooting for Outdoor Unit
Troubleshooting
Check No.31
Refer to P.221
(1) Mount a pressure gauge on the low pressure service
(2) Reset the operation using the remote controller, and
Service Checker
Connect the service checker to compare the low pressure
value and the actual measurement value by pressure
sensor by using the service checker. (See ∗2)
· The low pressure sensor is normal, and the pressure
detected with the PCB is also normal.
· The low pressure has really become low.
Check No.31
1: Compare the voltages of the pressure sensor and the pressure gauge.
2: Measure the voltage of the pressure sensor.
187
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
NO
Is the stop valve open?
YES
port.
then restart the operation.
Are the
characteristics of the
NO
low pressure sensor
normal? (See ∗1.)
YES
Check if
the low pressure
NO
value and the actual
measurement value
by pressure sensor
are the
same.
YES
Remove the causes by which the low
pressure has become low.
(For the voltage of the pressure sensor, measure the voltage at the connector, and then convert
it to pressure, referring to page 226.)
GND
Microcomputer
A/D input
Measure the voltage here.
Open the stop valve.
Replace the low pressure sensor.
Replace the main PCB (A1P).
+5V
X18A (Blue)
Red
(4)
Black
(3)
White
(2)
(1)
SiUS181305E
(R15632)
Low
pressure
sensor
(R15587)
Troubleshooting