Inverter Compressor Motor Lock - Daikin RXQ12AHR Service Manual

SiAF341904E

5.25 Inverter Compressor Motor Lock

Applicable All outdoor unit models
Models
E5
Error Code
Method of Error Inverter PCB takes the position signal from UVW line connected between the inverter and
Detection compressor, and the error is detected when any abnormality is observed in the phase-current
waveform.
Error Decision
When the inverter compressor motor does not operate even by starting it in forced startup
Conditions mode.
Supposed  Inverter compressor lock
Causes  High differential pressure (0.5 MPa or more)
 UVW connection error
 Defective inverter PCB
 The stop valve is not opened.
Troubleshooting
Part 6 Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Check in Monitor Mode
For the models equipped with 2
compressors, check the
compressor M1C or M2C applicable
to the error code E5 while in
monitor mode of the outdoor unit.
Is the stop
valve open?
YES
Check for the connection wiring.
• For compressor M1C
• For compressor M2C
Is the
connection line
of the relevant
compressor
Power OFF
normal?
YES
Are wire
connections
made to phases U, V
and W in the proper
order and
manner?
YES
Are wire
connections
made according
to the wiring
diagram?
YES
A
NO
NO
NO
NO
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Troubleshooting by Error Code
Field factor
Open the stop valve.
Replace the connection line,
and then securely connect the
connector.
Make proper wire connections.
W
U
V
Make proper wire connections.
223