Daikin R71FUV1 Service Manual page 176

Troubleshooting by Remote Controller
Troubleshooting
Caution
Is
the stop valve
open?
YES
(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?
(∗1)
YES
Service Checker
Connect the service checker to compare the "low
pressure" value checked with the Service Checker
and the actual measurement value by pressure
sensor.
Check if
the "low
pressure" value
and the actual
measurement value by
pressure sensor
are the same.
YES
· 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
CHECK 15
pressure has become low.
CHECK 7
CHECK 15
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
may be damaged.
NO
NO
CHECK 7
NO
Refer to P.470.
Refer to P.485.
Si20-701_B
Open the stop
valve.
Replace the low
pressure sensor.
Replace the
outdoor unit main
PCB.
169