Service manual

Refrigeration System

Safety Limit #2

Harvest time exceeds 3.5 minutes for 3 consecutive harvest cycles.

Possible Cause Check/Correct

Improper installation • See “Installation/Visual Inspection Checklist” on page 7-10

Water system • Water area (evaporator) dirty

• Dirty/defective water dump valve

• Vent tube not installed on water outlet drain

• Water freezing behind evaporator

• Plastic extrusions and gaskets not securely mounted to the evaporator

• Low water pressure (20 psi min.)

• Loss of water from sump area

• Clogged water distribution tube

• Dirty/defective water fill valve

• Defective water pump

Electrical system • Ice thickness probe out of adjustment

• Ice thickness probe dirty

• Bin switch defective

• Premature harvest

Refrigeration system • Non-Manitowoc components

• Water regulating valve dirty/defective

• Improper refrigerant charge

• Defective hot gas valve

• TXV flooding (check bulb mounting)

SAFETY LIMIT NOTES

• Because there are many possible external problems, do not limit your diagnosis to only the items listed in

this chart.

• A continuous run of 100 harvests automatically erases the safety limit code.

• The control board will store and indicate only one safety limit – the last one exceeded.

• If the toggle switch is moved to the OFF position and then back to the ICE position prior to reaching the

100-harvest point, the last safety limit exceeded will be indicated.

• If the harvest light did not flash prior to the ice machine restarting, then the ice machine did not stop

because it exceeded a safety limit.