Scotsman CME306 - Manual (Page 32)

Service Diagnosis
CME306 & CME456
January 2000
Page 32
Problem or Symptom Possible Cause Probable Correction
Unit is off because of a
“Harvest Problem”
Ice sensors did not sense
ice falling, unit stayed in
harvest until the maximum
harvest time ran out.
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.
Ice sensors or 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 control float is
sticking.
Check/clean
Inlet water valve leaks thru Check water valve
Cubes are too small Purge valve leaks thru Check purge valve
Not enough water Check for leak in reservoir
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.
Too much water Check for inlet water valve leak thru
Unit does not shut off
or cannot sense ice
falling
Ice sensor system may
have failed.
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.