Outdoor Unit: Inverter Stall Prevention, Compressor Lock - Daikin R407C PLUS Service Manual

Troubleshooting (Inverter)
5.4 Outdoor Unit:
Lock
L9
Remote
Controller
Display
!
Supposed
!
Causes
!
Troubleshooting
198
Inverter Stall Prevention, Compressor
Defect of compressor
Pressure differential start
Defect of inverter unit
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
The difference
between high and low
pressure when starting is
2kg / cm = (0.196
2
MPa).
YES
Disconnect the connection
between the compressor and
inverter.
Inverter
output voltage
check
Inverter output
voltage is not balanced.
(Normal if within ±8V)
(Note) Must be
measured when
frequency
is stable.
YES
After turning
on again, "L9" blinks
again.
YES
NO
NO
NO
Troubleshooting R407C PLUS Series Heat Recovery System
Si33-105
Unsatisfactory pressure
equalization
Check refrigerant system.
Replace the inverter unit.
Reset and restart.
Compressor inspection
Inspect according to the diagnosis
procedure for odd noises, vibration
and operating status of the
compressor.
(VF066)