Inverter Compressor Motor Lock - Daikin LRMEQ3BY1 Service Manual

Troubleshooting

7.6.2 Inverter Compressor Motor Lock

E5
Error Code
LRMEQ3~4BY1
Applicable
Models
Inverter PCB takes the position signal from UVW line connected between the inverter and
Method of Error
compressor, and the error is detected when any abnormality is observed in the phase-current
Detection
waveform.
This error will be output when the INV. compressor motor does not start up even in forced
Error Decision
startup mode.
Conditions
 INV. compressor lock
Supposed
 High differential pressure (0.5MPa or more)
Causes
 Incorrect UVW wiring
 Defective or wrong inverter PCB
 Stop valve is not opened
 Slugging state of refrigerant
 Abrasion of sliding parts caused by wet operation due to defective secondary equipment
 Failure of oil return due to defective onsite piping work
 Liquid return caused by operation signal connection failure (P1/P2)
74
expansion valve
Air Cooled Refrigeration Condensing Unit
ESIE17-20A