Daikin VRV III RXYQ5-54PY1, Service Manual

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Troubleshooting by Indication on the Remote Controller Si34-601A
266 Troubleshooting
3.35
“
L9
”
Outdoor Unit: Inverter Start up Error
Remote
Controller
Display
L9
Applicable
Models RXYQ5P~54P
Method of
Malfunction
Detection This malfunction code will be output if overcurrent occurs at the time of startup.
Malfunction
Decision
Conditions When the startup control is failed.
When an overcurrent is passed to the inverter due to the malfunction of a compressor or
electrical system.
Supposed
Causes
„
Defect of compressor
„
Failure to open the stop valve
„
Pressure differential start
„
Faulty compressor connection
„
Defect of inverter PC board
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Power OFF
NO
NO
NO
NO
YES
YES
YES
NO
YES
NO
Are wire
connections properly
made (according to the
Wiring Diagram)?
The insulation
resistance is low (i.e.,
not more than
100k
Ω
.)
Does the
power transistor have any
abnormalities?
Is the stop valve
open?
Disconnect the cable from the
compressor, and then check
the compressor for the
insulation resistance.
Check the power transistor on
the inverter PC board using a
multiple tester.
Connect the compressor cable,
and then restart the operation.
Check the compressor cable for
any disconnection or flaws.
Open the stop valve.
Rectify the wire
connections.
Replace the
compressor.
Replace the inverter
PCB.
The inverter is likely to
have got faulty due to
the malfunction of the
compressor.
After the completion of
replacement, be sure
to check the
compresssor.
A