Service manual

Service Diagnosis
May 2011
Page 9
SCN60
Service
Problem Likely Cause Probable Solution
No ice
No power Plug unit into power supply
Unit switched off Push and release on/off button
No water, water diagnostic light is on
Restore water supply, check sensor. If
RO water is too pure, unit cannot
operate.
Check float valve for restriction
Check float valve shut off lever position
Compressor on, fan on, auger motor not
operating
Check auger motor for voltage, if none,
replace controller. If there is voltage,
check auger motor windings, if open,
replace auger motor.
Compressor on, fan on, auger motor
cutting off on over amp safety
Check evaporator for ice. Thaw out and
retry. Check top bearing and condition of
auger. Replace if worn.
Operate unit for a short time with auger
out of machine, water shut off and water
sensor bypassed. If auger motor still
overloads, replace gear reducer.
Compressor on, auger on, fan blade not
turning
Check fan blade for ease of rotation,
remove any blockage and retry. Check
fan motor, replace if not turning freely or
motor windings open.
Auger motor on, fan on, compressor not
drawing power
Check compressor start relay, check
compressor windings.
Auger motor on, fan on, compressor
cutting off on overload
Check compressor. See component
diagnostics.
Compressor on, fan on, auger motor on,
ice sweep not turning
Check ice sweep. If tight to auger, auger
is not turning. Gears stripped, replace
gear reducer.
Unit off on auger motor open safety
Check connections to auger motor, if
voltage to motor and it does not operate,
replace motor.
Unit plugged in but no power
If pump model check for water back up
or open safety switch.
Check transformer, replace if not
supplying 12 volts AC to controller.
Check switch membrane. See
component diagnostics.
If transformer and membrane are good,
replace controller.