Service Manual for Models CU0415, CU0715 and CU0920
August 2013
Page 22
Service Diagnosis
Problem
Possible Cause
Probable Correction
No ice, fan motor not turning
No power to it
Check controller Freeze NO terminal to
COM for proper voltage. If blue freeze light
is on and no voltage, replace controller
Check fan pressure control, if air
temperature is over 70 degrees F, the
pressure control should be closed when in
freeze mode.
Open windings
Check motor for continuity, replace if open
Inlet water valve on all the time
Low voltage to machine, do not operate
with wrong voltage
No ice, everything operating, poor
spray to evaporator
Spray platform leaking
Check seams of spray platform, be sure it is
sealed together.
No ice, everything operating, good
spray to evaporator
Too much water
Check inlet water valve for leaking thru and
overfilling reservoir, replace valve if leaking
No ice, everything operating, water in
reservoir is hotter than supply water
Hot gas valve not shutting off
Check body of hot gas valve, if hot, replace
valve.
No ice, everything operating
Not enough refrigeration
Check suction line temperature. When blue
freeze mode light is on, suction line should
begin to get cold. If not, confirm compressor
is operating.
No ice in bin, evaporator mold forms
ice properly
No heat for harvest, ice does not
release
Hot gas valve does not open. Check water
valve, if it adds water during harvest and
the hot gas valve does not open, replace
the hot gas valve. If both are not opening,
replace the controller.
Very cold water supply
Increase harvest time.
Damaged evaporator
Check plating and replace if needed
No ice, compressor is off
Compressor relay not working
Check current relay for proper operation,
replace if not working
Compressor overload open, will
not reset
Check / replace overload
Compressor windings open
Check compressor windings, replace
compressor if motor is open
Compressor overheated
Check refrigeration system for proper
charge
Makes ice but ice is cloudy or not
completely formed
Spray jets restricted by mineral
scale
Clean ice machine water system
Lack of rinse water due to hot
room temperature
Harvest time affects how much water is
used to rinse the reservoir, if harvest time is
short and mineral scale builds up fast adjust
controller for more harvest time to add more
rinse water.
