Service Diagnosis - Scotsman UC2024 Series Service Manual

UC2024 and UC2724 Service Manual

Service Diagnosis

Symptom
No ice in bin
Possible Cause
Unplugged or loose plug in
outlet
Unit switched off
No water to unit, sump not
filling
Inlet water solenoid valve
not opening
No water over evaporator
plate, sump is full
Inlet water valve leaks thru
False bin full
Tripped breaker
Open fuse in unit
High pressure control open
Fan not turning during
freeze mode
No refrigeration
Evaporator plate is warm in
freeze mode
November 2019
Probable Correction
Check, if plug is loose in outlet have outlet replaced
Remove front panel, confirm master switch is in the
ON position
Check for water filter plugged up, replace if
necessary
Check for water interruption at site
Check coil of valve, check for voltage to valve.
Replace if it will not open with full voltage.
Check pump for voltage to it during freeze, if full
voltage, and water in sump, check for blockage
of water to pump. If no blockage and full voltage,
replace pump. If in freeze, and no voltage and Anti
Slush light is not on, replace controller.
Check inlet water valve, It must shut off completely
when off. Replace if it leaks by.
Check flap, it must be in the open position or the
unit will not operate
Check flap / curtain switch. It must be open when
flap is open. Replace if it does not react to the flap
magnet.
Check for electrical short in unit.
Slide out electrical box and check fuse. If open,
check for burnt or shorted controller.
If water cooled, check that water supply has not
been interrupted. If air cooled, fan motor must
operate or high pressure control will open.
Check fan motor windings, fan motor for free
rotation, system charge, check fan pressure control
cut in
Compressor off, check for overheating.
Compressor not starting. Check starting
components. Check compressor windings.
No power to compressor. Check contactor. Check
power to contactor coil, if none and water pump is
working, replace controller.
Low charge or TXV superheat too high. Add charge
to confirm if charge or TXV is the issue.
Hot gas valve not shutting off or leaking by.
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