Service Diagnosis: Controller Diagnostic Light Analysis
CME256, 506, 656, 806: AutoIQ™ Cubers
January 2002
Page 23
Problem or Symptom Possible Cause
Probable Correction
Machine is off
Bin is full, ice in cube port
Use some ice
Power is off, check
controller 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
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. Check
levelness, check standpipe height.
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.** On
controllers 17-1 and higher, this also indicates
that cubes were “sensed” by the bin controls.
Hot Gas Valve failure
Check hot gas valve operation.
High Discharge Temp
If the refrigeration diagnostic light blinks 3
times and then repeats, check for a reason for
high discharge temperatures.
Harvest problem
Controllers 17-1 and higher, if the lite blinks 2
times and repeats, check for a harvest error -
no cubes sensed.
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 maxi 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, but 1 light is on
Reservoir temp. wrong
Reset and 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
