Service Diagnosis - Scotsman CME650 Service Manual

CME650

Service Diagnosis:

SYMPTOM
No ice is made, nothing operates
No ice is made
POSSIBLE CAUSE
Unit off, due to no power
Unit off, due to master switch in
OFF position
Unit off, due to bin thermostat
open
Unit off, due to hi pressure cut out
open
Unit off, due to hi temperature cut
out open
Unit off, due to circuit board open
No water due to water turned off.
No water due to water filter
plugged.
No water due to inlet water valve
screen plugged
No water due to strainer screen
plugged
No water due to Inlet water valve
coil open
No water due to inlet water valve
will not open
Water in reservoir, but no water
over evaporators
No cooling at evaporator due to
compressor switched off
No cooling at evaporator due to
too much heat load because inlet
water valve leaks thru
No cooling at evaporator due to
hot gas valve leaking thru
No cooling at evaporator due to
fan not turning
No cooling at evaporator due to
dirty condenser
August 1994
Page 18
PROBABLE FIX
Restore power
Switch master switch to ON
Check temperature at bin
thermostat bracket, if warmer
o
than 40 F., thermostat should be
closed. Adjust/replace thermostat.
Reset and check for dirty
condenser, hot location, or water
interruption (if water cooled).
Hot gas valve leaking thru,
replace hot gas valve.
Check for short circuit and
replace circuit board.
Reconnect water supply
Replace water filter
Clean out inlet screen
Clean out inlet screen
Replace valve
Replace valve
Water pump does not work,
replace pump
Switch compressor on.
Replace inlet water valve
Replace hot gas valve
Check & replace fan motor or fan
control switch
Clean condenser