Service Manual

114 Part Number: 000015431 Rev 02 6/20
Harvest Valve Analysis
Symptoms of a harvest valve remaining partially open
during the freeze cycle can be similar to symptoms of
either an expansion valve or compressor problem. Use
the following procedures to determine if a harvest valve is
remaining partially open during the freeze cycle.
QUIETQUBE® HARVEST VALVE ANALYSIS
The valve can fail in two positions:
• Valve will not open in the Harvest cycle.
• Valve remains open during the Freeze cycle.
Valve will not open in the Harvest cycle
Although the circuit board has initiated a Harvest cycle,
suction and discharge pressures remain unchanged from
the Freeze cycle. The ice machine will remain in the
Harvest cycle for 7 minutes, then initiate a thaw cycle.
Valve remains open in the Freeze cycle
Symptoms of a harvest valve remaining partially open
during the Freeze cycle can be similar to symptoms of an
expansion valve or compressor problem. Symptoms are
dependent on the amount of leakage in the Freeze cycle.
A small amount of leakage will cause increased freeze
times and an ice fill pattern that is normal.
As the amount of leakage increases, the length of the
Freeze cycle increases and the amount of ice on the
bottom of the evaporator decreases.
A small amount of leakage will cause an audible indication
as the vapor passes through the valve. As the size of the
leak increases, the audible indication becomes more
apparent.