Service manual

SiUS28-902_a Troubleshooting by Indication on the Remote Controller
Troubleshooting 106
3.17 “E5” Inverter Compressor Motor Lock
Remote
Controller
Display
E5
Applicable
Models
RZQ18~30PVJU
Method of
Malfunction
Detection
Inverter P.C.B. takes the position signal from UVW line connected between the inverter and
compressor, and the malfunction is detected when any abnormality is observed in the phase-
current waveform.
Malfunction
Decision
Conditions
This malfunction will be output when the inverter compressor motor does not start up even in
forced startup mode.
Supposed
Causes
 Compressor lock
 High differential pressure (72psi or more)
 Incorrect UVW wiring
 Faulty inverter P.C.B.
 Stop valve is left in closed position.