Scotsman FME24RLM - Manual (Page 18)

SERVICE DIAGNOSIS
Symptom Possible Cause Probable Correction
No ice is made, nothing
operates
Unit off due to no power. Restore power
Unit off due to master switch in Off position Move master switch to ON
Unit off due to low water level in reservoir
Check water supply, filter and
float valve.
Unit off due to ice level sensors
(photo-electric eyes) blocked
Check/clean ice level sensors
Unit off due to scale on water level sensor Clean water level sensor
Auger motor hums but does not turn Auger can’t turn. Circuit board
has not yet shut unit down.
Auger turning but there is no refrigeration
effect
Liquid line valve not opening,
check coil, check board relay.
No refrigerant to ice machine,
check main system.
Unit is shut 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. May also be due to
liquid line valve leak thru during
the off cycle. Check valve.
Auger not turning Due to: motor failure; auger relay
failure on circuit board; or gears
stripped. Check drive train.
Low suction pressure Liquid line valve not opening due
to coil failure or failure of
compressor relay on circuit board
EPR setting too low, check/adjust
TXV restricted or not metering.
Check bulb temperature.
No power to circuit board Check harness
Circuit board gear motor relay will not close Check / replace board
Water level or ice level sensor failed
Check / replace sensor
No ice, auger motor is
turning
Liquid line valve coil is open Check / replace valve coil
Circuit board relay will not close Check / replace board
Unit makes ice, but very
slowly
High discharge pressure because of dirty
condenser
Clean condenser.
Auger and evaporator are coated with
minerals
Clean the water system
Low suction pressure due to low EPR
setting
Adjust EPR, check TXV
superheat
Double System RL
November 2000
Page 18