Manitowoc SD0302A Technician's Handbook page 130

YES
Is head pressure high &
YES
YES
NO Is harvest valve energized?
suction pressure low
in harvest?
Replace Harvest Valve
Refer to Sequence of
Operation &
NO
Wiring Diagrams
Is head pressure low &
YES
suction pressure low
in harvest?
Refer to Harvest Pressure
Regulating Valve
NO
Diagnostics
Refer to Symptom #4 -
Will Not Harvest, Freeze
Cycle Normal & Ice Cubes are
YES
Melted Flowchart
Is head pressure normal & Repeat this flowchart &
NO
suction pressure normal verify all data
in harvest?
Single Evaporator Systems with Dual Harvest Valves: If one Harvest Vavle is open and the other is restricted / stuck closed you may have
normal harvest pressures. Look for ice not melting on one side of the evaporator.
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