Compressor Motor Lock - Daikin RMXS-L Series Service Manual

SiUS181305E
7.4

Compressor Motor Lock

E5
Error Code
Method of Error
The position signal is taken from UVW line, and the malfunction is detected when any abnormality
Detection is observed in the phase-current waveform.
Error Decision
When the compressor motor does not start up even in forced startup mode
Conditions
 Compressor lock
Supposed
 High differential pressure (0.5 MPa (167 ftAq) or more)
Causes
 Incorrect UVW wiring
 Defective outdoor unit PCB
 Stop valve is left closed.
Troubleshooting
Check the installation
conditions.
Troubleshooting
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
NO
Is the stop valve
open?
YES
NO
Are the UVW
wirings normal?
YES
Is high
differential
YES
pressure starting? (0.5
MPa (167 ftAq)
or more)
NO
Check
and see whether
Short circuited
the compressor is short
circuited or
grounded.
Grounded
Are
inverter output
NO
voltages the same for 3
phases?
YES
Does
low or high
pressure vary even
YES
instantaneously when
restarting
compressor?
NO
Troubleshooting for Outdoor Unit
Open the stop valve.
Connect them correctly.
Remedy the cause.
Replace the compressor.
Replace the main PCB
(A1P).
Replace the compressor.
(R19093)
188