Daikin VRV IV-S RXTQ-TAVJU Series Service Manual page 181

SiUS331604E
Troubleshooting
∗1: Make a comparison between the voltage of the pressure sensor and that read by the pressure
Note:
CHECK1
CHECK12
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Check for the points shown below.
(1) Is the stop valve open?
(2) Is the high pressure switch connector properly
connected to the main PCB?
(3) Does the high pressure switch have continuity?
Are the three points
above OK?
YES
(1) Mount a pressure gauge on the high pressure
service port.
(2) Reset the operation using the remote controller,
and then restart the operation.
Does the abnormal
stop E3 recur?
NO
Are the
characteristics of the
high pressure sensor
normal? (∗1)
YES
Service Checker
Compare the high pressure value checked with the Service Checker and
the actual value measured by pressure sensor (∗1).
Check
if the high
pressure value and the
actual value measured by
pressure sensor are
the same.
YES
· The high pressure sensor is normal, and the pressure detected with the PCB is also normal.
· The high pressure has really become high.
Remove the causes by which the high pressure has become
CHECK 1
high.
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 222.
Refer to page 234.
NO
Is the
high pressure
YES
switch operating
value normal (4.0 MPa
(580 psi))?
YES
NO
NO
)
CHECK12
Troubleshooting by Error Code
Rectify the defective points,
if any.
NO
Replace the high pressure switch.
Replace the high pressure sensor.
Replace the outdoor main
PCB (A1P).
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