Daikin REYQ-AATJA, Service Manual, Page: 387 / 495

SiUS372201EA Troubleshooting by Error Code
Part 6 Service Diagnosis 380
3.58 Compressor Startup Abnormality
Applicable
Models
All outdoor unit models
Error Code
L9
Method of Error
Detection
Detect error according to the signal waveform of compressor.
Error Decision
Conditions
When compressor startup operation has not been completed.
Supposed
Causes
 The stop valve is not opened

Defective compressor
 Error in wire connections to compressor
 Large differential pressure before compressor startup
 Defective inverter PCB
Troubleshooting
YES
NO
NO
Apply power, and then restart
operation.
NO
Are the
leads of the
compressor
disconnected?
Connect the leads of the compressor.
YES
Is the
insulation
resistance of the relevant
compressor 100 k
Ω
or more?
Replace the compressor.
NO
YES
YES
YES
Refrigerant is
stagnated. (The unit is out
of power supply for more
than 6 hours.)
Solve the refrigerant stagnation.
(Power should be supplied for more
than 6 hours.)
YES
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Is the stop valve
open?
Startup for
the first time after
installation?
Is a proper
amount of refrigerant
charged?
Open the stop valve.
NO
Charge a proper amount of
refrigerant.
NO
A
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