Troubleshooting for Outdoor Unit SiEN18-622
364 Troubleshooting
7.4 Compressor Motor Lock
Remote Control
Display
E5
Applicable
Models
AII outdoor unit models
Method of
Malfunction
Detection
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-
current waveform.
Malfunction
Decision
Conditions
This malfunction will be output when the inverter compressor motor does not start up even in
forced startup mode.
Supposed
Causes
Compressor lock
High differential pressure (0.5MPa or more)
Incorrect UVW wiring
Faulty inverter PCB
Stop valve is left in closed.
Troubleshooting
Check the installation
conditions.
Is the stop valve open?
NO
Is the UVW wiring
normal?
NO
NO
NO
NO
Is high
differential pressure starting?
(0.5MPa or more)
YES
YES
YES
Check and see
whether compressor is
short-circuited or
ground.
YES
YES
Are inverter
output voltages the same
for 3 phases?
Does low or
high pressure vary
even instantaneously when
restarting
compressor?
YES
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
(V2793)
NO
Open the stop valve.
Connect correctly.
Remedy the cause.
Replace the compressor.
Replace the compressor.
Replace the inverter PC
board (A1P).
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