Troubleshooting for Outdoor Unit SiBE18-821_C
388 Troubleshooting
7.4 Compressor Motor Lock
Remote
Controller
Display
E5
Method of
Malfunction
Detection
The position signal is taken from UVW line, and the malfunction is detected when any
abnormality is observed in the phase-current waveform.
Malfunction
Decision
Conditions
When the compressor motor does not start up even in forced startup mode
Supposed
Causes
îš„
Compressor lock
îš„
High differential pressure (0.5 MPa or more)
îš„
Incorrect UVW wiring
îš„
Defective outdoor unit PCB
îš„
Stop valve is left closed.
Troubleshooting
Check the installation
conditions.
Is the stop valve
open?
Are the UVW
wirings normal?
Is high
differential pressure
starting? (0.5 MPa
or more)
Check
and see whether
compressor is short
circuited or
ground.
Are
inverter output
voltages the same for 3
phases?
Does
low or high
pressure vary even
instantaneously when
restarting
compressor?
Open the stop valve.
Connect them correctly.
Remedy the cause.
Replace the compressor.
Replace the main PCB
(A1P).
Replace the compressor.
(R13020)
NO
YES
YES
NO
Ground
YES
NO
YES
Short circuited
NO
YES
NO
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
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