Service Diagnosis - Scotsman CME1356 User Manual

CME1356 and CME1656

Service Diagnosis

Problem or Symptom
Unit is off because of
a "Harvest Problem"
Cubes are too large
Cubes are too small
Low ice capacity
Unit does not shut off
or cannot sense ice
falling
Possible Cause
Bin controls did not sense
ice falling, unit stayed in
harvest until the maximum
harvest time ran out.
Bin controls or AutoIQ
Controller may have failed.
Other components may
have failed
Cube size control float is
sticking.
Inlet water valve leaks thru
Purge valve leaks thru
Not enough water
Dirty condenser or filter
Recirculation of air
Low refrigerant charge
Too much water
Ice sensor system may
have failed.
May 2000
Page 30
Probable Correction
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.
See "Unit does not shut off" below.
Check the next page
Check/clean
Check water valve
Check purge valve
Check for leak in reservoir
Replace filters, clean condenser
Block air re-circulation or move condenser
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.
Check for inlet water valve leak thru
Check ice sensors. 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.