Daikin VRV II RXYQ8MY1K, Service Manual

Page: 201 / 310

Troubleshooting by Indication on the Remote Controller Si39-502A
190 Troubleshooting
3.34
“
L8
”
Outdoor Unit: Inverter Current Abnormal
Remote
Controller
Display
L8
Applicable
Models RXYQ8~30MY1K (E), YLK (E)
Method of
Malfunction
Detection Malfunction is detected by current flowing in the power transistor.
Malfunction
Decision
Conditions When overload in the compressor is detected. (Inverter secondary current 15.0A)
Supposed
Causes
„
Compressor overload
„
Compressor coil disconnected
„
Defect of inverter PC board
Troubleshooting
Output current check
(V2813)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Inverter
output
voltage check
Inverter output voltage
is not balanced.
(Normal if within
±
10V)
Must be measured
when frequency
is stable.
Compressor overload
Inspection of the compressor and
refrigerant system is required.
Compressor inspection
Inspect according to the diagnosis
procedure for odd noises, vibration
and operating status of the
compressor.
NO
Replace the inverter PC board.
YES
NO
Reset and restart.
NO
The secondary
current of the inverter is
higher than 15A
for each phase.
Replace the compressor.
NO
YES
Compressor
inspection The
compressor's coil is
disconnected.
YES
YES
Disconnect the connection
between the compressor and
inverter. Make the power
transistor check mode setting
ON by service mode.
After turning
on again, "L8" blinks
again.