Scotsman SCE170 - Manual (Page 21)

SYMPTOM POSSIBLE CAUSE PROBABLE FIX
Machine operates, no ice is
formed. Unit stuck in harvest cycle. Check for curtain stuck closed.
Cubes too small, adjust bridge
thickness, see Cube Size/Bridge
thickness section
Refrigerant leak Locate leak, repair, replace dryer,
evacuate and weigh in nameplate
charge
Compressor will not operate Check compressor contactor coil.
Check compressor.
Check compressor start circuit
Hot gas valve stuck open. Replace hot gas valve.
Refrigerant leak. Locate leak, repair, replace dryer,
evacuate and weigh in nameplate
charge.
Hot gas valve and purge valve
stay on after curtains close and
both curtain indicator lights are on. Replace control board.
Purge valve leaks thru. Clean or replace purge valve
Compressor cycles on and off. Compressor overheats. Low on refrigerant. Repair leak,
evacuate and weigh in nameplate
charge
Air cooled - fan not blowing,
repair fan.
TXV not letting enough refrigerant
into evaporators, replace TXV.
Mechanical fault with compressor,
replace compressor.
Check start capacitor
Check start relay
Frost on compressor Some frost will not hurt. Do nothing.
TXV meters too much refrigerant. Replace TXV.
To check bin control system:
When curtain is closed, BOTH
curtain indicator lights on the
control board in the control box
should be ON, if not: Curtain not closed properly Check action of curtains
Sensor not in correct position Place sensor assembly in correct
position
Curtain missing Replace curtain
Curtain sensor has failed. Replace sensor assembly.
Service Diagnosis
SCE170
October 1998
Page 21