Daikin VRV II-Q RQYQ8-48PY1B Service Manual page 131

SiBE341027
Troubleshooting
Service Diagnosis
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Connect the service checker.
Set up a pressure gauge at the service port on the
high pressure side.
Reset the operation and then restart the operation.
Is suction pipe
thermistor property
normal?
YES
Check if discharge
pipe thermistor
property is normal.
YES
Check if high
pressure sensor
property is normal.
YES
Service Checker
Look for the following indoor unit by service checker
• Gas pipe temperature (R4T)
-Liquid pipe temperature (R3T) < 3˚C
&
• Opening degree of electronic expression
valve < 300 pls
Stop the indoor unit (the system is in cooling
operation) and check the liquid pipe temperature of
the indoor unit after the system has stabilized.
The liquid pipe
temperature is low
(equivalent to the
evaporating
temperature).
NO
Troubleshooting by Remote Controller
NO
NO
NO
YES
Replace the suction pipe
thermistor.
Replace the discharge pipe
thermistor.
Replace the high pressure sensor.
Replace the indoor unit electronic
expansion valve.
Clean the air filter of the indoor
unit.
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