L8" Outdoor Unit: Inverter Current Abnormal - Daikin CMSQ200A7W1B Service Manual

SiBE28-805
L8
3.32 " " Outdoor Unit: Inverter Current Abnormal
L8
Remote
Controller
Display
Applicable CMSQ200A7, 250A7
Models
Method of Malfunction is detected by current flowing in the power transistor.
Malfunction
Detection
Malfunction When overload in the compressor is detected. (Inverter secondary current 16.1A)
Decision
Conditions
Supposed
Causes
Troubleshooting Output current check
Power ON
Power OFF
Troubleshooting
Compressor overload
Compressor coil disconnected
Defect of inverter PC board
Faulty compressor
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
A current
of not less than 15A
flows through the
compressor.
NO
Is the stop valve
open?
YES
Are wire
connections properly
made (according to the
Wiring Diagram)?
YES
Disconnect the cable from the
compressor, and then check
the compressor for the
insulation resistance.
The insulation
resistance is low, i.e.,
not more than
100kΩ.)
NO
Check the power transistor on
the inverter PC board using a
multiple tester.
Does the
power transistor have any
abnormalities?
NO
Connect the compressor cable,
and then restart the operation.
A
Troubleshooting by Indication on the Remote Controller
YES
NO
NO
Check the compressor cable for
any disconnection or flaws.
YES
YES
Overcurrent:
Check the compressor
and refrigerant system
(in the same manner as
that for E3).
Open the stop valve.
Rectify the wire
connetions.
Replace the
compressor.
Replace the inverter PC
board.
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.
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