Refer to Sequence of
Operation &
Wiring Diagrams
YES
YES
YES
NO
NO
NO
YES
NO
YES
Is harvest valve energized?
Is head pressure high &
suction pressure low
in harvest?
Replace Harvest Valve
Is head pressure low &
suction pressure low
in harvest?
Is head pressure normal &
suction pressure normal
in harvest?
Refer to Harvest Pressure
Regulating Valve
Diagnostics
Repeat this flowchart &
verify all data
Refer to Symptom #4 -
Will Not Harvest, Freeze
Cycle Normal & Ice Cubes are
Melted Flowchart
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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