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CU50
Service Manual
Service Diagnosis
Makes excessive noise
Problem
Fan blade vibrates
Compressor vibrates
Water pump vibrates
Panels vibrate
Makes ice, does not harvest
Problem
Ice wrong size
Little heat to evaporator
Makes poor quality ice
Problem
Spray pattern poor
Runs out of water
High TDS water supply
Makes ice, but melts rapidly
Problem
Restricted drain
Pooled water in bin
Membrane Switch Diagnostics
Unplug and check connector pins (left side is pin 1),
read about 10 ohms when activating the button,
and OL when not pressing the button: Pin 2-3
On/Off Switch; 4-3 Clean Reset Switch
Likely Cause
Blade is bent
Fan motor mount is broken
Mounting loose
Pump bearings worn
Mounting screws loose
Likely Cause
Environment changed
Hot gas valve does not open
Water temperature very low
Fan motor does not stop
Likely Cause
Spray jets dirty
Water leaking from reservoir
Groundwater supply
Likely Cause
Gravity drain hose has air block
Pump model switch not starting
pump
August 2010
Page 25
Probable Solution
Replace fan blade
Replace motor mount
Check mounting
Replace pump
Tighten screws
Probable Solution
Adjust cube size
Check voltage to coil when unit is
in harvest, check controller
indicator light.
Adjust harvest time
Check voltage, replace controller
Probable Solution
Clean jets
Correct leak
Treat water
Probable Solution
Check for kinks or traps
Check / replace switch
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