Panasonic CU-8ME1XPK - Outdoor Unit: Inverter Thermostat Sensor, Compressor Overload

PACD011001C2 Troubleshooting (Inverter)
Troubleshooting UM Combination “MA1R Series” Using R-407C 537
5.3 Outdoor Unit: Inverter Thermostat Sensor, Compressor Overload
Remote Controller
Display
L8
Supposed Causes
„
Compressor overload
„
Compressor coil disconnected
„
Defect of inverter unit
Troubleshooting
Output current check
(VF065)
Inverter
output voltage
check
Inverter output voltage
is not balanced.
(Normal if within ±8V)
(Note) 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 unit.
YES
NO
Reset and restart.
NO
The secondary
current of the inverter is
higher than 27.5A
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.
After turning on again,
"L8" blinks again.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.