Service Diagnosis
CME256, 506, 656, 806: AutoIQ™ Cubers
January 2002
Page 24
Problem or Symptom Possible Cause
Probable Correction
Unit is off because of a
“Harvest Problem”
Bin controls did not sense
ice falling, unit stayed in
harvest until the maximum
harvest time ran out.
Check bin controls. The bin full light should be
off. If it is on or blinking the bin controls may
be dirty. Clean if dirty. The board and bin
controls may also need to be checked.
Push and release Off button. Push and
release Freeze button. Check machine
operation. Check if ice is made and harvests.
Bin controls or System
Controller may have failed.
See “Unit does not shut off” below..
Other components may
have failed
Check the next page
Cubes are too large
Cube size float sticking.
Check/clean
Cubes are too small
Not enough water
Check for leak in reservoir
Two plate models
making ice thicker on
one plate than another
A - D series - refrigerant
distributor restricted
Change distributor
CME506 E series -
expansion valve bulbs on
wrong suction line
Switch bulbs to correct suction lines
CME506 E series - one
TXV not metering
Check TXV, replace if there is poor ice
formation on its plate
Low ice capacity
Dirty condenser or filter
Replace filters, clean condenser
Recirculation of air
Block air re-circulation or move condenser
Low refrigerant charge
Check system. If there is a low charge, find
the leak, recover the refrigerant, repair the
leak, replace the dryer, evacuate and weigh in
the nameplate charge.
Cube size set wrong
Re-adjust cube size
Unit does not shut off
Bin control system may
have failed.
Check bin controls. Check bin full light, if off,
place something between the electric eyes.
The bin full light should begin to blink (after 20
seconds of continuous blockage it will glow
steadily). If not, check operation of electric
eyes by unplugging #4 and jumping out the
two pins on the controller (first discharge any
static electricity by touching the cabinet with
the tool). If the bin full light blinks, replace the
bin controls. If it does not blink, replace the
controller. Note: Leaving #4 unplugged and
jumped for 20 seconds will shut the machine
down on a bin full (at the end of the harvest
cycle). It will restart after 4 minutes or may be
reset by pushing the Freeze button.