PACD011001C2 Troubleshooting (Inverter)
Troubleshooting Urban Multi “MX1R, ME1R Series” Using R-407C 385
5.4 Outdoor Unit : Inverter Stall Prevention, Compressor Lock
Remote Controller
Display
L9
L9L9
L9
Supposed Causes
„
Defect of compressor
„
Pressure differential start
„
Defect of inverter unit
Troubleshooting
Inverter
output voltage
check Inverter output
voltage is not balanced.
(Normal if within ±8 V [3φ, 380~
415V]) (Note) Must be
measured when
frequency
is stable.
Unsatisfactory pressure equalization.
Check refrigerant system.
Compressor inspection.
Inspect according to the diagnosis
procedure for odd noises, vibration and
operating status of the compressor.
YES
YES
Replace the inverter unit.
NO
NO
Reset and restart
NO
The
difference
between high and low
pressure when starting is less
than 2 kg / cm² =
(0.196 MPa).
YES
Disconnect the connection
between the compressor and
inverter.
After turning
on again, "L9" blinks
again.
(VF066)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
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