Troubleshooting - Daikin VRV II-Q RQYQ8-48PY1B Service Manual

SiBE341027

Troubleshooting

Note:
*1: Make a comparison between the voltage of the pressure sensor and that read by the pressure gauge.
*2: Make measurement of voltage of the pressure sensor.
Service Diagnosis
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Check for the points shown below.
(1) Is the stop valve opened?
(2) Are the high pressure switch and pressure switch
connector properly connected to the main PCB?
(3) Do the high pressure switch and pressure switch have
continuity?
Are the two points
above OK?
YES
(1) Mount a pressure gauge on the high pressure service port
and dual pressure gas stop valve service port.
(2) Reset the operation using the remote controller, and then
restart the operation.
YES
Does the stop
due to error
E3
( ) recur?
NO
NO
Are the
characteristics of the
high pressure sensor
normal? (*1.)
YES
Service Checker
Connect the service checker to compare the "high pressure" value and the
actual measurement value by pressure sensor (*1) by using the service
checker.
Check if the "high
pressure" value and the
actual measurement value
by pressure sensor are
the same.
YES
· The high pressure sensor is normal, and the pressure detected with the PCB are also normal.
· The high pressure or field piping pressure has really become high.
Remove the causes by which the high pressure or field piping
CHECK 1
pressure has become high.
(As to the voltage of the pressure sensor, make measurement of voltage at the connector, and then convert it to pressure.)
CHECK 1 Refer to P.179
NO
Is the
pressure switch NO
pressure switch
operating value normal
operating value normal
(i.e., 3.3MPa)?
(i.e., 4.0MPa)?
YES
NO
NO
Troubleshooting by Remote Controller
Rectify defective points,
if any.
Is the high
NO
Replace the high
pressure switch and
pressure switch.
YES
Replace the high
pressure sensor.
Replace the outdoor
unit main PCB (A1P).
107