Service Diagnosis: Diagnostic Light Analysis - Scotsman CME456R Product Manual

Service Diagnosis: Diagnostic Light Analysis

Problem or Symptom
Machine is off
Unit is off on a Water
Error
Unit is off on a
Refrigeration Error
Unit runs and both
Diagnostic lites are ON
Same, only 1 light on
* Machine may be reset by pushing and releasing the Off button, then pushing and releasing the
Freeze button. ** See following pages
Possible Cause
Bin is full
Bin full light is ON, no ice
in cube port
Bin thermostat is closed
Power is off, check
Lights.
Transformer is open
Unit has been switched
off or has finished a
Clean cycle, Off Light is
glowing
Unit has Shut Down
Water supply inadequate Check water Light, if the Light blinks 2 times
Water pump malfunction
Water level sensor may
have failed.
Low discharge or long
freeze cycle
Harvest problem
High Discharge Temp
Unit does not go into
harvest - exceeds
maximum freeze time
Exceeds maximum
harvest time
Temperature sensors
out of range
Reservoir temp. wrong
December 2000
Page 27
Probable Correction
Use some ice
Check optional thermostat, check ice sensor
lens for scale.
Check thermostat
If all Lights are out, check power supply,
restore power if off
If all Lights are out and there is power, check
transformer output for 24 vac
Push and release Freeze button
Check for Refrigeration or Water Error
and repeats, check the water inlet valve for
proper water flow.**
Check that pump hose is attached and if pump
is plugged in and working.
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.
Check refrigeration Light. If the Light is
glowing, there is a probable refrigeration
problem - fan motor could have failed.
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**
Check refrigeration Light. If the Light blinks 3
times and then repeats, check for a reason for
high discharge temperatures - fan motor hot
ambient.
Push and release Off button. Push and release
Freeze button. Check operation.
Push cube size float down and check
operation.
Check for cause of long harvest cycle**
Replace the temperature sensor set (water and
discharge).
Check water temp. and sensor.
CME456R