Service Diagnosis - Scotsman FME1200 Service Manual

NME950 & FME1200

SERVICE DIAGNOSIS:

Symptom
No ice is made, nothing
operates
No ice, auger motor is turning
Unit makes ice, but very slowly. High discharge pressure
Possible Cause
Unit off due to no power
Unit off due to master switch in
OFF position.
Unit off due to low water level.
Unit off due to ice level
sensors (photo-electric eyes)
blocked.
Unit off due to scale on water
level sensor.
Unit off due to high pressure
control open.
Auger motor does not turn.
Low pressure control open
Centrifugal switch in auger
motor does not close.
No power to circuit board,
transformer is open.
Circuit Board gear motor relay
will not close
Water level or ice level sensor
failed.
Compressor contactor coil is
open
Compressor will not start
Circuit board compressor relay
will not close.
because of a dirty condenser
Low capacity because the
auger and evaporator are
coated with mineral scale
Low suction pressure due to
low refrigerant charge
January 1995
Page 20
Probable Correction
Restore Power
Switch master switch to ON.
Check water supply, filter,
strainer, float valve. Correct
water supply.
Check/clean ice level sensors.
Clean water level sensor.
Check for water interruption
(water cooled) or fan motor
failure (air cooled).
Winding open, bearings
seized. Check/replace auger
motor.
Check that auger turns
Check charge.
Check for a restricted system
Check/replace centrifugal
switch.
Replace transformer.
Check, replace board
Check, replace sensor
Check/replace contactor
Check start capacitor.
Check start relay
Check compressor windings
Check, replace board
Clean the air filter and
condenser.
Clean the water system
Locate leak. Recover
refrigerant, repair leak, replace
dryer, evacuate and weigh in
the nameplate charge