Troubleshooting; Checklist - Manitowoc SM Serie Manual De Instalación, Operación Y Mantenimiento

Checklist

If a problem arises during operation of your ice machine, follow the checklist below before calling service. Routine adjustments
and maintenance procedures are not covered by the warranty.
Problem
Ice machine does not operate.
Ice machine stops, and can be restarted by
turning the ice machine OFF and then ON.
Ice sheet is thick.
Ice machine does not release ice or is slow to
harvest.
Ice machine does not cycle into harvest
mode.
Ice quality is poor (soft or not clear).
Ice machine produces shallow or incomplete
cubes, or the ice fill pattern on the evaporator
is incomplete.
Low ice capacity.
Part Number 000001590 Rev05 07/22
Section 5

Troubleshooting

Possible Cause
No electrical power to the ice machine.
Ice machine needs to be turned on.
Damper in open position (down).
Safety limit feature stopping the ice machine.
Water trough level is too high.
Power button was turned off/on during freeze
cycle and ice remained on evaporator.
Ice damper was opened then closed in the
harvest cycle before the ice released.
Long harvest cycles with repeated safety limit
indication.
Ice machine is dirty.
Ice machine is not level.
Low air temperature around ice machine (air-
cooled models).
Water regulating valve leaks in harvest mode
(water-cooled models).
The six-minute freeze time lock-in has not
expired yet.
Harvest float switch is dirty.
Harvest float switch wire is disconnected.
Harvest float switch is out of adjustment.
Uneven ice fill (thin at top of evaporator).
Poor incoming water quality.
Water filtration is poor.
Ice machine is dirty.
Water softener is working improperly (if
applicable).
Ice thickness switch is out of adjustment.
Water trough level is too high or too low.
Water filtration is poor.
Hot incoming water.
Incorrect incoming water pressure.
Ice machine is not level.
The condenser is dirty.
High air temperature around ice machine (air-
cooled models).
Inadequate clearance around the ice
machine.
Objects stacked around ice machine, blocking
airflow to condenser (air-cooled models)
Hot incoming water.
To Correct
Replace the fuse/reset the breaker/turn
on the main switch/plug power cord into
receptacle.
Press the On/Off button to start ice making.
Damper must be in upright position and
capable of swinging freely.
Refer to "Safety Limit Feature" on the next
page.
Adjust ice thickness float.
Allow ice to thaw and release from
evaporator, then restart.
Allow ice to thaw and release from
evaporator, then restart.
Call for service.
Descale and sanitize the ice machine.
Level the ice machine.
Air temperature must be at least 40°F (4°C).
Replace water regulating valve.
Wait for freeze lock-in to expire.
Descale and sanitize the ice machine.
Connect the wire.
Adjust the harvest float switch.
See "Shallow or Incomplete Cubes" below.
Contact a qualified service company to test
the quality of the incoming water and make
appropriate filter recommendations.
Replace the filter.
Descale and sanitize the ice machine.
Repair the water softener.
Adjust the ice thickness switch.
Check the water level.
Replace the filter.
Connect the ice machine to a cold water
supply.
Water pressure must be 20 – 80 psi (137.9 –
551.5 kPa)
Level the ice machine.
Clean the condenser.
Air temperature must not exceed 110°F
(43°C).
Provide adequate clearance.
Remove items blocking airflow.
Connect the ice machine to a cold water
supply.
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