Scotsman SCE170 - Manual (Page 20)

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