Scotsman SCE170 User Manual page 20

SCE170
Service Diagnosis
SYMPTOM
Unit shuts off before bin is full.
Makes ice, but cubes are
mal-formed.
Cubes/bridge too thick.
Cubes too small, unit may stay in
harvest because ice will not push
curtain open.
Machine goes into harvest, but
ice on evaporator will not defrost -
freezes up.
Unit freezes, but will not try to
harvest.
Low capacity/long freeze cycle.
Long harvest cycle
POSSIBLE CAUSE
Ice hangs up between curtain and
reservoir.
Water distributor is dirty.
Cube size set wrong.
Refrigerant leak. Cubes will be
smaller or missing beginning at
the top half of the evaporator.
Cube size control set too cold.
Refrigerant leak, causing suction
line temperature to be warm,
keeping unit in the freeze cycle.
Cube size control set too warm.
Short freeze cycle caused by
slush.
Cube size set too small.
Cube size set too large.
Hot gas valve will not open.
Cube size control will not close; to
check: Unplug water pump,
switch unit Off and then ON, in
about 2 minutes the Timed
Freeze Light on control board
should be ON
Timed freeze light glows, but after
4 minutes unit does not power hot
gas nor purge valves.
Very low on refrigerant
Extreme hot location
Air cooled condenser or filter dirty. Clean condenser/filter.
Cubes too big.
Water leak from reservoir.
Float valve does not shut off.
Water temperature very high
Purge valve leaks by slowly.
Overcharged with refrigerant.
Hot gas valve leaks thru
Cube size set too large
Sticking in harvest
October 1998
Page 20
PROBABLE FIX
Check action of curtain, check
cube size.
Clean water system.
Adjust cube size control.
Locate leak, repair, replace dryer,
evacuate and weigh in nameplate
charge
Adjust cube size control.
Locate leak, repair, replace dryer,
evacuate and weigh in nameplate
charge
Adjust cube size control.
Some slush is normal. Check
purge valve for leak-thru.
Adjust cube size control.
Adjust cube size control.
Coil of valve open, replace.
Valve will not open, replace.
If timed freeze light does not go
ON, replace cube size control.
Replace control board
Check pressures
Relocate the unit.
Adjust cube size control.
Repair leak.
Replace float.
Advise user
Replace purge valve.
Evacuate and weigh in nameplate
charge
Check hot gas valve. There
should be frost on line between
evaporator and valve during the
freeze cycle.
Adjust cube size
Check cube size or for slush