Service Diagnosis - Scotsman SCE170 User Manual

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
No ice is made
No ice is made, nothing operates. No power
Unit does not shut off.
POSSIBLE CAUSE
No water due to water turned off.
No water due to float valve
plugged up.
No water due to float stuck in
closed position.
No water due to purge valve
leaking water down drain.
Water in reservoir, no flow over
evaporator due to water leak at
discharge hose.
Water in reservoir, no flow over
evaporator due to pump not
operating.
Water in reservoir, no flow over
evaporator due to water
distributor plugged up.
Unit in CLEAN or Harvest cycle
ON/OFF/CLEAN switch in OFF
position
Curtain in open position
High pressure cut out open, reset
and check:
Control board open
Curtain sensor does not work.
October 1998
Page 19
SCE170
PROBABLE FIX
Reconnect water supply.
Clean out float.
Replace float.
Replace purge valve.
Repair leak.
Replace pump.
Clean water system.
Switch ON/OFF/CLEAN switch to
OFF and then ON.
Reconnect power.
Switch ON/OFF/CLEAN switch to
ON.
Check for obstruction keeping the
curtain open. Check that curtain
is properly mounted. Check
curtain sensor & indicator light.
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.
Replace control board.
Check curtain sensor and control
system.