Compressor Motor Lock - Daikin E-Series Service Manual

Troubleshooting for Outdoor Unit
7.4

Compressor Motor Lock

E5
Remote
Controller
Display
Applicable AII outdoor unit models
Models
Method of Inverter PCB takes the position signal from UVW line connected between the inverter and
compressor, and the malfunction is detected when any abnormality is observed in the phase-
Malfunction
current waveform.
Detection
Malfunction This malfunction will be output when the inverter compressor motor does not start up even in
forced startup mode.
Decision
Conditions
Supposed
Causes
Troubleshooting
362
Compressor lock
High differential pressure (0.5MPa or more)
Incorrect UVW wiring
Faulty inverter PCB
Stop valve is left in closed.
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Check the installation
conditions.
Is the stop valve
open?
YES
Is the UVW wiring
normal?
YES
Is high
differential pressure
starting? (0.5MPa or
more)
NO
Check and
see whether compressor
is short-circuited or
ground.
NO
Are
inverter output
voltages the same for
3 phases?
YES
Does
low or high
pressure vary even
instantaneously when
restarting
compressor?
NO
NO
NO
YES
YES
NO
YES
SiAU18-715
Open the stop valve.
Connect correctly.
Remedy the cause.
Replace the compressor.
Replace the inverter PC
board (A1P).
Replace the compressor.
(Q0553)
Troubleshooting