Service Diagnosis - Scotsman FME1504R Service Manual

NME1254R & FME1504R

SERVICE DIAGNOSIS:

Symptom
No ice is made, nothing operates
Possible Cause
Unit off due to no power.
Unit off due to master switch in Off
position
Unit off due to low water level in
reservoir
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 hums but does not turn
Unit is shut down
Pump down pressure control open,
very low suction pressure
No power to circuit board
Circuit board gear motor relay will not
close
Water level or ice level sensor failed
January 2000
Page 24
Probable Correction
Restore power
Move master switch to ON
Check water supply, filter and float
valve.
Check/clean ice level sensors
Clean water level sensor
Check for remote condenser fan
motor failure or power interruption to
the fan motor
Auger can't turn. Circuit board has not
yet shut unit down.
Circuit board has shut ice machine
down due to high auger motor amp
draw. Check for cause of high amp
draw, including bearings, gear motor
condition and scale on auger &
evaporator.
Auger not turning due to: motor
failure; auger relay failure on circuit
board; or gears stripped. Check drive
train.
Liquid line valve not opening due to
coil failure or failure of compressor
relay on circuit board
TXV restricted or not metering. Check
bulb temperature.
Lack of refrigerant. Check for a leak.
Check harness
High or Low Pressure switch open
Check / replace board
Check / replace sensor