Daikin VRV IV-S RXTQ-TAVJU Series Service Manual page 183

SiUS331604E
Troubleshooting
∗1: Make a comparison between the voltage of the pressure sensor and that read by the pressure
Note:
CHECK2
CHECK12
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
valve open?
indoor unit failing?
(Does the remote controller
display an error other
(1) Mount a pressure gauge on the low pressure
service port.
(2) Reset the operation using the remote
controller, and then restart the operation.
characteristics of the
low pressure
sensor normal?
Service Checker
Compare the low pressure value checked with the Service
Checker and the actual value measured by pressure sensor
(∗1).
low pressure value
and the actual value
measured by pressure sensor
· The low pressure sensor is normal, and the pressure
detected with the PCB is also normal.
· The low pressure has really become low.
Remove the causes by which the low pressure
CHECK 2
has become low.
gauge.
(As to the voltage of the pressure sensor, make measurement of voltage at the connector, and
then convert it to pressure.
Refer to page 223.
Refer to page 234.
Is the stop NO
YES
Is the
NO
than E4?)
YES
Are the
NO
(∗1)
YES
Check if the
NO
are the same.
YES
CHECK12 )
Troubleshooting by Error Code
Open the stop valve.
Eliminate the indoor unit error.
Replace the low pressure sensor.
Replace the outdoor main
PCB (A1P).
170