Troubleshooting by Indication on the Remote Controller
SiUS30-1301
186
Service Diagnosis
3.21 Inverter Compressor Motor Lock
Error Code
E5
Applicable
Models
RWEYQ72P, 84P
Method of Error
Detection
Inverter PCB takes the position signal from UVW line connected between the inverter and
compressor, and the error is detected when any abnormality is observed in the phase-current
waveform.
Error Decision
Conditions
This error will be output when the inverter compressor motor does not start up even in forced
startup mode.
Supposed
Causes
Inverter compressor lock
High differential pressure (72.5 psi or more)
Incorrect UVW wiring
Defective inverter PCB
Stop valve is not opened
Troubleshooting
The
compressor coil
has disconnection of
wires.
Is the
wiring the
same as in the
electric wiring
diagram?
Is the
connection of
UVW phase order
correct?
Are
the relay wires
to the compressor
correct?
Is the stop
valve open?
The
insulation
resistance of the
compressor is low (not
more than
100k
Ω
).
NO
YES
NO
YES
NO
YES
NO
YES
YES
YES
NO
NO
Local factor
Open the stop valve.
Replace the relay wires and
ensure right connection of the
connector.
Ensure correct connection.
Ensure correct connection.
Replace the compressor.
U
W
V
Check if the wiring has
any error in mistake for
inverter compressor.
Power OFF
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
A