Manitowoc STH042 4/16, Technician'S Handbook

Page: 58 / 146

58 Part Number STH042 4/16
Problem Possible Cause Correction
Ice quality is poor
(soft or not clear).
Poor incoming water
quality.
Test the quality of the
incoming water and
make appropriate filter
recommendations.
Water filtration is poor. Replace the filter.
Ice machine is dirty. Clean and sanitize the ice
machine.
Water softener is
working improperly (if
applicable).
Repair the water softener
Ice machine
produces shallow
or incomplete
cubes, or the ice
fill pattern on
the evaporator is
incomplete.
Ice thickness switch is
out of adjustment.
Adjust the ice thickness
switch
Water trough level is
too high or too low.
Check the water level.
Water filtration is poor. Replace the filter.
Hot incoming water. Connect the ice machine
to a cold water supply.
Incorrect incoming
water pressure.
Water pressure must be
20-80 psi (137.9 -551.5 kPa)
Ice machine is not
level.
Level the ice machine
Low ice capacity.
The condenser is dirty. Clean the condenser.
High air temperature
around ice machine
(air-cooled models).
Air temperature must not
exceed 110° F (43°C).
Inadequate clearance
around the ice
machine.
Provide adequate
clearance
Objects stacked
around ice machine,
blocking condenser
airflow
Remove items blocking
airflow
Hot incoming water. Connect to cold water
Incorrect incoming
water pressure. Water
pressure is too low or
water filter is restricted.
Water pressure must be
20-80 psi (137.9 -551.5
kPa). Replace water filter.
Ice sheet is thick
Water trough level is
too high
Adjust ice thickness float
Power button was
turned off/on during
the freeze cycle and
ice remained on the
evaporator
Allow ice to thaw
and release from the
evaporator, then restart
Ice damper was
opened and closed
in the harvest cycle
before the ice released
Allow ice to thaw
and release from the
evaporator, then restart
Long harvest cycles
with repeated safety
limit indication
Clean the ice machine
& perform diagnostic
procedures as required