Service Diagnosis: Controller Diagnostic Light Analysis - Scotsman CME1356 User Manual

Service Diagnosis: Controller Diagnostic Light Analysis

Problem or Symptom
Machine is off
Unit is off & Water
diagnostic light is ON
or BLINKING
Unit is off &
Refrigeration
diagnostic light is ON
or BLINKING
Unit runs and both
Diagnostic lites are ON
Same, but 1 light is 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, ice in cube port
Power is off, check lights.
Bin thermostat is closed
Transformer is open
Unit has been switched off
Off lite is glowing
Compressor will not start
Unit has Shut Down
Water inlet valve
malfunction
Water pump malfunction
Water level not sensed or
not high enough
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
May 2000
Page 29
CME1356 and CME1656
Probable Correction
Use some ice
If all lights are out, check power supply,
restore power if off
Check thermostat for ice on the bulb. If none,
check adjustment.
If all lights are out and there is power, check
transformer output for 24 vac
Push and release Freeze button to restart unit.
Not enough water or water not sensed.
Check for Refrigeration or Water Error
Check water diagnostic light, if it blinks 2
times 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 harness from sensor.
If the Refrigeration light is glowing steadily,
there is a probable refrigeration 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.
If the refrigeration diagnostic light blinks 3
times and then repeats, check for a reason for
high discharge temperatures.
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).
Reset and check water temp and sensor.