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CU50
Service Manual
Service Diagnosis
No Ice
Problem
No power to unit
No power to controller
Control panel failure
Shut down on maximum
water fill time - water light
flashing
Very long freeze cycle
Cannot make ice
Likely Cause
Power disconnected
Transformer open
Switch open
Water shut off
Water leak
Dirty condenser
Restricted location, intake air too hot
or blocked
Evaporator thermistor not sensing
properly
Spray jets dirty
Inlet water valve leaks through
during freeze
Low on refrigerant
Connected to hot water
Spray pump not pumping
Fan motor not turning
Pump hose disconnected
Very low on refrigerant
Compressor not operating
Hot gas valve leaks through during
freeze
Compressor inefficient
August 2011
Page 24
Probable Solution
Check breaker or fuse. Reset or
replace, restart and check
Replace transformer
Check membrane, see page 25.
Restore water supply
Check curtain, sump
Clean condenser
Eliminate restriction, have machine
moved
Check thermistor
Remove spray platform and clean
spray jets
Check inlet water valve
Check cube formation,
Check for bleed thru from / missing
check valve in building water
supply
Check pump motor
Check fan motor, check fan blade,
check controller for voltage output
Check hose
Add access valve, add refrigerant
as a test. If unit makes ice, find and
correct leak.
Check compressor start
components, check PTCR
resistance and temperature
Check compressor voltage
Check compressor windings
Check hot gas valve for hot outlet
during freeze
Check compressor amp draw, if
low and all else is correct, change
compressor
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