Scotsman CU0415 - Manual (Page 24)

August 2013
Page 23
Service Manual for Models CU0415, CU0715 and CU0920
Problem Possible Cause Probable Correction
Makes ice but makes blocks or shells Ice bridge wrong size Adjust to proper size
Evaporator thermistor out of
calibration, adjustment erratic
Check thermistor resistance to chart,
replace if incorrect
Poor thermal contact of evaporator
thermistor to suction line
Check clip holding probe, must have metal-
to-metal contact and covered with insulation
Thermistor failure, unit operating
on timed cycles
Check controller for all green lights blinking,
if all blinking change thermistor set.
Makes ice but does not hold bridge
setting, gradually increases over time
Evaporator temperature taking
longer to get to cut in point
Refrigerant leak, check refrigeration
system.
Makes ice but does not fill the bin Bin thermostat opens and shuts
machine off before bin is full
Unit in cold room, check conditions.
Thermostat out of calibration, replace
Unit at high altitude, adjust compensation
screw
Unit makes ice but it is wet Normal Fresh ice will be wet
Water dripping / spraying on it Check curtain, may be torn or not in
position
Check that cube deflector is correctly
positioned
Makes ice but is slow, cannot keep
up
Air cooled condenser is dirty Clean condenser fins
Too much water Slight leak from inlet water solenoid valve,
check/replace valve
Air flow to cabinet restricted Confirm nothing blocking front louvers; unit
cannot operate in a closet
Room air hot Hot air slows ice making and increases bin
meltage
Restricted drain Water in bottom of bin melts ice, correct
drain so all water drains including the water
from harvest cycle
Ice on top of evaporator Drain slots plugged, clean water system
Slush in reservoir Do controller self check
Makes ice but is loud Some noise is normal, the fan,
pump and compressor all produce
sound
Check for fan blade touching debris or
shroud.
Check that all panel fasteners are on tight.
Identify loud part and replace it.
Door binds opening or closing Roller or pin is broken Check / replace door roller
Bin overfills Bin thermostat does not open Replace thermostat
Service Diagnosis