Scotsman SCE170 - Manual (Page 19)

Service Diagnosis
Proper service diagnosis begins with observation, comparing the complaint to the operation of the unit. Ice
machine service diagnosis should proceed from water, to electrical and then to refrigeration.
SYMPTOM POSSIBLE CAUSE PROBABLE FIX
No ice is made No water due to water turned off. Reconnect water supply.
No water due to float valve
plugged up. Clean out float.
No water due to float stuck in
closed position. Replace float.
No water due to purge valve
leaking water down drain. Replace purge valve.
Water in reservoir, no flow over
evaporator due to water leak at
discharge hose. Repair leak.
Water in reservoir, no flow over
evaporator due to pump not
operating. Replace pump.
Water in reservoir, no flow over
evaporator due to water
distributor plugged up. Clean water system.
Unit in CLEAN or Harvest cycle Switch ON/OFF/CLEAN switch to
OFF and then ON.
No ice is made, nothing operates. No power Reconnect power.
ON/OFF/CLEAN switch in OFF
position Switch ON/OFF/CLEAN switch to
ON.
Curtain in open position Check for obstruction keeping the
curtain open. Check that curtain
is properly mounted. Check
curtain sensor & indicator light.
High pressure cut out open, reset
and check: Air cooled: check fan motor for
stalling, condenser/filter for dirt,
loose fan blade.
Check water cooled unit for
proper water supply
If overcharged or there are non
condensables in refrigeration
system, replace refrigerant with
correct charge.
Replace H.P. cut out if it opens at
too low a pressure.
Unit may have stuck in harvest
cycle in a very warm ambient,
check operating conditions.
Control board open Replace control board.
Unit does not shut off. Curtain sensor does not work. Check curtain sensor and control
system.
SCE170
October 1998
Page 19