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Service Diagnosis
No Ice
Problem Likely Cause Probable Solution
No power to unit Power disconnected
Check breaker or fuse. Reset or
replace, restart and check
No power to controller Transformer open Replace transformer
Shut down on maximum
water fill time - water light
flashing
Water shut off Restore water supply
Very long freeze cycle
Water leak Check curtain, sump
Dirty condenser Clean condenser
Restricted location, intake air too
hot or blocked
Eliminate restriction, have machine
moved
Evaporator thermistor not sensing
properly
Check thermistor
Spray jets dirty
Remove spray platform and clean
spray jets
Inlet water valve leaks through
during freeze
Check inlet water valve
Low on refrigerant Check cube formation,
Connected to hot water
Check for bleed thru from / missing
check valve in building water
supply
Cannot make ice
Spray pump not pumping Check pump motor
Fan motor not turning
Check fan motor, check fan blade,
check controller for voltage output
Pump hose disconnected Check hose
Very low on refrigerant
Add access valve, add refrigerant
as a test. If unit makes ice, find and
correct leak.
Compressor not operating
Check compressor start
components, check PTCR
resistance and temperature
Check compressor voltage
Check compressor windings
Hot gas valve leaks through during
freeze
Check hot gas valve for hot outlet
during freeze
Compressor inefficient
Check compressor amp draw, if
low and all else is correct, change
compressor
March 2010
Page 24
CU50
Service Manual