Service Diagnosis: Diagnostic Light Analysis
CME456R
December 2000
Page 27
Problem or Symptom
Possible Cause
Probable Correction
Machine is off
Bin is full
Use some ice
Bin full light is ON, no ice
in cube port
Check optional thermostat, check ice sensor
lens for scale.
Bin thermostat is closed
Check thermostat
Power is off, check
Lights.
If all Lights are out, check power supply,
restore power if off
Transformer is open
If all Lights are out and there is power, check
transformer output for 24 vac
Unit has been switched
off or has finished a
Clean cycle, Off Light is
glowing
Push and release Freeze button
Unit has Shut Down
Check for Refrigeration or Water Error
Unit is off on a Water
Error
Water supply inadequate Check water Light, if the Light 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 sensor may
have failed.
Check float stem, reset machine. If it will not
reset or gives another water error and
everything else is OK, replace the water level
sensor.
Unit is off on a
Refrigeration Error
Low discharge or long
freeze cycle
Check refrigeration Light. If the Light is
glowing, there is a probable refrigeration
problem - fan motor could have failed.
Harvest problem
Check refrigeration Light. If the Light blinks
once and repeats, look for a harvest problem.
where some cubes were sensed.**
Check refrigeration Light. If the Light blinks two
times and repeats, look for a harvest problem. -
no cubes sensed**
High Discharge Temp
Check refrigeration Light. If the Light blinks 3
times and then repeats, check for a reason for
high discharge temperatures - fan motor hot
ambient.
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).
Same, only 1 light on
Reservoir temp. wrong
Check water temp. and sensor.
* Machine may be reset by pushing and releasing the Off button, then pushing and releasing the
Freeze button. ** See following pages
