Daikin E Series, Service Manual

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Troubleshooting for Outdoor Unit SiAU18-715
378 Troubleshooting
7.19 Inverter Compressor Abnormal
Remote
Controller
Display
L5
Applicable
Models AII outdoor unit models
Method of
Malfunction
Detection Malfunction is detected from current flowing in the power transistor.
Malfunction
Decision
Conditions When an excessive current flows in the power transistor.
(Instantaneous overcurrent also causes activation.)
Supposed
Causes
„
Defect of compressor coil (disconnected, defective insulation)
„
Compressor start-up malfunction (mechanical lock)
„
Defect of inverter PCB
Troubleshooting
Higher voltage than actual is displayed when the inverter output voltage is checked by tester.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Disconnect the connection
between the compressor
and inverter. Make the
power transistor check mode
setting ON by service mode.
The
compressor's coil
is disconnected or the
insulation is
defective.
There is
instantenious power
drop.
Inverter
output
voltage check
Inverter output voltage
is not balanced. (Normal if
within
±
5V Must be
measured when
frequency is
stable.
Compressor inspection
Compressor inspection
Inspect according to the
diagnosis procedure for
odd noises, vibration and
operating status of the
compressor.
(Q0568)
Replace the compressor.
YES
Correct power supply.
YES
Replace the inverter unit.
YES
NO
NO
NO