Compressor Motor Lock - Daikin Super Multi Plus E-Series FTXG25EV1BW Service Manual

Troubleshooting for Outdoor Unit
7.4

Compressor Motor Lock

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