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SERVICE DIAGNOSIS: Condition
Symptom
No ice is made, nothing operates
No ice, auger motor is turning
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 open
Water level or ice level sensor failed
Compressor contactor coil is open
Compressor will not start
Circuit board relay will not close
Pump down pressure switch does not
close, liquid line valve open and
suction pressure high
January 2000
Page 25
NME1854R & FME2404R
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
Hi or Low pressure switches open
Check / replace board
Check / replace sensor
Check / replace contactor
Check start capacitor
Check start relay
Check compressor windings
Check / replace board
Check pump down switch contacts
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