Scotsman CME306 - Manual (Page 31)

Service Diagnosis: Controller Diagnostic Light Analysis
CME306 & CME456
January 2000
Page 31
Problem or
Symptom
Possible Cause Probable Correction
Machine is off Bin is full, ice in cube port Use some ice
Bin full light on, no ice in
cube port
Check optional thermostat, check for scale on
ice sensor lens
Power is off, check lights. If all lights are out, check power supply, restore
power if off
Optional bin thermostat is
closed
Check thermostat for ice on the bulb. If none,
check adjustment.
Transformer is open If all lights are out and there is power, check
transformer output for 24 vac
Unit has been switched off
Off lite is glowing
Push and release Freeze button to restart unit.
Compressor will not start Not enough water or water not sensed.
Unit has Shut Down Check for Refrigeration or Water Error
Unit is off & Water
diagnostic light is ON
or BLINKING
Water inlet valve
malfunction
Check water diagnostic light, if it blinks 2 times
and repeats, check the water inlet valve for
proper water flow.**
Water pump malfunction Check that pump hose is attached and if pump
is plugged in and working.
Water level not sensed or
not high enough
Check harness from sensor.
Unit is off &
Refrigeration
diagnostic light is ON
or BLINKING
Low discharge or long
freeze cycle
If the Refrigeration light is glowing steadily,
there is a probable refrigeration problem
Harvest problem If the Refrigeration light blinks once and
repeats, look for a harvest problem.** This also
indicates that cubes were “sensed” by the bin
controls.
If the lite blinks 2 times and repeats, check for a
harvest error - no cubes sensed.
High Discharge Temp If the refrigeration diagnostic light blinks 3 times
and then repeats, check for a reason for high
discharge temperatures.
Unit does not go into
harvest - exceeds
maximum freeze time
Push and release Off button. Push and release
Freeze button. Check operation.
Push cube size float down and check operation.
Exceeds maximum harvest
time
Check for cause of long harvest cycle**
Unit runs and both
Diagnostic lites are
ON
Temperature sensors out
of range
Replace the temperature sensor set (water and
discharge).
* Machine may be reset by pushing and releasing the Off button, then pushing and releasing the Freeze
button. ** See following pages