Scotsman CME306 Product Manual page 32

CME306 & CME456
Service Diagnosis
Problem or Symptom Possible Cause
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
Ice sensors did not sense
ice falling, unit stayed in
harvest until the maximum
harvest time ran out.
Ice sensors or 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.
January 2000
Page 32
Probable Correction
Check ice sensors. 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.