Inverter Compressor Motor Lock - Daikin RXYQ-TA Series Service Manual

Troubleshooting by Error Code

3.31 Inverter Compressor Motor Lock

E5
Error Code
Applicable
All outdoor unit models
Models
Method of Error
Outdoor unit 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 mode.
Conditions
Supposed
Causes
Troubleshooting
219
Inverter compressor lock
High differential pressure (0.5 MPa (72.5 psi) or more)
UVW connection error
Defective inverter PCB
The stop valve is not opened
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Check in Monitor Mode
12/14 ton classes are equipped with
2 compressors.
Check for the compressor 1 or 2
applicable to the error code E5
while in monitor mode of the
outdoor unit PCB.
Is the stop
valve open?
Check for the connection wiring.
For Compressor 1
Connection wiring on the M1C side
For Compressor 2
Connection wiring on the M2C side
Is the
connection
line of the relevant
compressor
normal?
Power OFF
Are wire
connections
made to phases U, V
and W in the proper
order and
manner?
Are wire
connections made
according to the Wiring
Diagram?
A
NO
YES
NO
YES
NO
YES
NO
YES
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.
Service Diagnosis
SiUS341615E