Outdoor Unit: Inverter Stall Prevention, Compressor Lock - Panasonic Urban Multi MX1R Series Service Manual

Troubleshooting (Inverter)
5.4 Outdoor Unit:
L9
Remote Controller
Display
„ Defect of compressor
Supposed Causes
„ Pressure differential start
„ Defect of inverter unit
Troubleshooting
538
Inverter Stall Prevention, Compressor Lock
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 2
2
kg / cm = (0.196
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 UM Combination "MA1R Series" Using R-407C
PACD011001C2
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)