Inverter Compressor Starting Abnormality - Daikin VRV II-Q RQYQ8-48PY1B Service Manual

SiBE341027

2.24 Inverter Compressor Starting Abnormality

L9
Remote
Controller
Display
Applicable RQYQ-PY1B
Models
Method of Error Error is detected based on the signal waveform of the compressor.
Detection
Error Decision Starting the compressor does not complete.
Conditions
Supposed
Causes
Troubleshooting
Service Diagnosis
Stop valve is not opened
Defective compressor
Wiring connection error to the compressor
Large pressure difference before startup the compressor
Defective inverter PCB
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Is it the initial time to
start after installation?
YES
Is a right amount of
refrigerant charged?
YES
Is the stop valve
opened?
YES
Refrigerant
is melting in refrigerant
oil. (The unit is out of
power supply for more
than 6 hours.)
NO
Is the
insulation resistance of
the compressor more
than 100k Ω ?
YES
Are the compressor lead
wires disconnected?
NO
Troubleshooting by Remote Controller
NO
Go on to the next page.
(Starting failure due to aged operation.)
NO
Charge a right amount of
refrigerant.
NO
Open the stop valve.
YES
Cancel the melting state of
refrigerant.
NO
Cancel the melting state of
refrigerant.
YES
Fix the compressor lead wire.
Correct the wiring then supply the
power to restart.
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