Manitowoc Indigo Series Technician's Handbook page 193

Harvest Cycle
QUIETQUBE ® REMOTE CONDENSING UNIT
QuietQube® ice machines may fail in the harvest cycle
when the refrigerant charge and ambient temperature
create a marginal undercharge of refrigerant. The ice
machine may be able to make a full sheet of ice, but fails
in the harvest cycle when the receiver runs out of liquid
refrigerant. A safety limit #2 will result when the ice
machine is unable to harvest.
Undercharge Symptoms
• Safety limit #1 or Safety limit #2 in control board
memory, a flashing triangle alert and after pressing
left arrow Long Freeze or Long Harvest is displayed.
• Harvest cycle suction pressure is low.
• Harvest cycle discharge pressure is low.
• Liquid line entering receiver feels warm to hot in the
freeze cycle.
Overcharge Symptoms
• Safety limit #2 in control board memory, a flashing
triangle alert and after pressing left arrow Long
Harvest is displayed.
• Harvest cycle discharge pressure is normal.
• Freeze cycle time, suction and discharge pressure
are normal and the ice machine will not harvest. The
sheet of ice cubes show little or no sign of melting
when removed from the evaporator after the harvest
cycle has been completed. (If the cubes are melted
you have a release problem, clean the ice machine).
Part Number STH026 6/15 193