Outdoor Unit: Inverter Stall Prevention, Compressor Lock - Daikin VRV R-407C PLUS Series Service Manual

Troubleshooting (Inverter)
5.4

Outdoor Unit: Inverter Stall Prevention, Compressor Lock

L9
Remote Controller
Display
Supposed Causes
Troubleshooting
162
Defect of compressor
Pressure differential start
Defect of inverter unit
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
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.
Troubleshooting R-407C PLUS Series
SiE 00-07
(VF066)