Service manual

Service Diagnosis:
SYMPTOM POSSIBLE CAUSE PROBABLE FIX
No ice is made, nothing operates Unit off, due to no power Restore power
Unit off, due to ICE/OFF/WASH
switch in OFF position
Switch ICE/OFF/WASH switch to
ICE
Unit off, due to bin thermostat
open
Check temperature at bin
thermostat bracket, if warmer than
40
o
F., thermostat should be
closed. Adjust/replace thermostat.
Water cooled unit off, due to high
pressure cut out open
Lack of water to condenser,
check water supply and water
regulating valve.
No ice, compressor off No cooling due to compressor not
operating
Check compressor for voltage,
continuity, and operation. Check
starting components. Replace if
found to be faulty.
If no voltage, check contactor,
replace if coil or contacts open.
Check temperature of
compressor, if hot may be lack of
refrigerant, defective TXV or
compressor
No ice is made, compressor is
operating
No water due to water turned off. Reconnect water supply
No water due to water filter
plugged.
Replace water filter
No water due to strainer screen
plugged
Clean out inlet screen
No water due to inlet water valve
will not open
Replace valve
Water in reservoir, but no water
over evaporators
Water pump does not work,
replace pump
No cooling at evaporator due to
hot gas valve leaking thru
Replace hot gas valve
No cooling at evaporator due to
fan not turning
Check & replace fan motor.
Fan and pump do not have
power; hot gas valve opens and
closes.
Coil or relay open, replace relay.
No cooling at evaporator due to
dirty condenser
Clean condenser
No cooling due to compressor not
pumping
Check system pressures, replace
compressor if not pumping
SLC400
November 1994
Page 19