S Model Before Calling For Service
Section 5 Before Calling For Service
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 Possible Cause To Correct Ice machine does not operate. No electrical power to the ice machine
and/or condensing unit.
Replace the fuse/reset the breaker/turn on the main switch.
High pressure cutout tripping. Clean condenser coil. (See Section 4)
ICE/OFF/CLEAN toggle switch set improperly.
Move the toggle switch to the ICE position.
Water curtain stuck open. Water curtain must be installed and swinging freely. (See Section 4)
Remote receiver service valve and/or Liquid/suction line shut off valves are closed.
Open the valve(s). (See Section 2) Ice machine stops, and can be restarted
by moving the toggle switch to OFF and back to ICE.
Safety limit feature stopping the ice machine.
Refer to “Safety Limit Feature” on the next page.
Ice machine does not release ice or is slow to harvest.
Ice machine is dirty. Clean and sanitize the ice machine. (See Section 4)
Ice machine is not level. Level the ice machine. (See Section 2)
Low air temperature around ice machine head section.
Air temperature must be at least 35°F (1.6°C).
Fan cycling control does not de-energize condenser fan motor.
Verify pressure is below cut-out setpoint, replace fan cycling control.
Ice machine does not cycle into harvest mode.
The six-minute freeze time lock-in has not expired yet.
Wait for the freeze lock-in to expire.
Ice thickness probe is dirty. Clean and sanitize the ice machine. (See Section 4)
Ice thickness probe is disconnected. Connect the wire.
Ice thickness probe is out of adjustment. Adjust the ice thickness probe. (See Section 3)
Uneven ice fill (thin at the top of evaporator).
Verify sufficient water level in sump trough. Contact a qualified service company to check refrigeration system.
Ice quality is poor (soft or not clear). Poor incoming water quality. Contact a qualified service company to
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.
(See Section 4)
Water dump valve is not working. Disassemble and clean the water dump valve. (See Section 4)
Water softener is working improperly (if applicable).
Repair the water softener.
Safety Limit Feature
In addition to the standard safety controls, such as the high pressure cutout, your Manitowoc ice machine
features built-in safety limits which will stop the ice machine if conditions arise which could cause a major
Before calling for service, re-start the ice machine using the following procedure:
1. Move the ICE/OFF/CLEAN switch to OFF and then back to ICE.
A. If the safety limit feature has stopped the ice machine, it will restart after a short delay.
Proceed to step 2.
B. If the ice machine does not restart, see “Ice machine does not operate” on the previous page.
2. Allow the ice machine to run to determine if the condition is recurring.
A. If the ice machine stops again, the condition has recurred. Call for service.
B. If the ice machine continues to run, the condition has corrected itself. Allow the ice machine to
Problem Possible Cause To Correct
Ice machine produces shallow or incomplete cubes, or the ice fill pattern on the evaporator is incomplete.
Ice thickness probe is out of adjustment. Adjust the ice thickness probe. (See Section 4)
Water trough level is too low. Check the water level probe for damage. (See Section 3)
Water inlet valve filter screen is dirty. Remove the water inlet valve and clean the filter screen. (See Section 4)
Water filtration is poor. Replace the filter.
Hot incoming water. Connect the ice machine to a cold water supply. (See Section 2)
Water inlet valve is not working. Replace the water inlet valve.
Incorrect incoming water pressure. Water pressure must be 20-80 psi (1.4 bar - 5.5 bar)
Ice machine is not level. Level the ice machine.
(See Section 2)
Low ice capacity. Water inlet valve filter screen is dirty. Remove the water inlet valve and clean
the filter screen. (See Section 4)
Incoming water supply is shut off. Open the water service valve.
Water inlet valve stuck open or leaking. Place toggle switch in OFF position, if
water continues to enter water trough replace the water inlet valve.
The condenser is dirty. Clean the condenser. (See Section 4)
High air temperature entering condenser. Air temperature must not exceed 120°F (39°C)
The harvest assist air compressor is not functioning. Call for service
Before Starting the Ice Machine
All Manitowoc ice machines are factory-operated and adjusted before shipment. Normally, new installations do
not require any adjustment.
To ensure proper operation, follow the Operational Checks in Section 3 of this manual. Starting the ice
machine and completing the Operational Checks are the responsibilities of the owner/operator.
Adjustments and maintenance procedures outlined in this manual are not covered by the warranty.
AuCS® Automatic Cleaning System
This optional accessory monitors ice making cycles and initiates cleaning procedures automatically. The AuCS®
accessory can be set to automatically clean or sanitize the ice machine every 2, 4 or 12 weeks. Refer to the
AuCS® Installation, Use and Care Manual for details.
Potential Personal Injury Situation
Do not operate equipment that has been misused. abused, neglected, damaged, or altered/modified
from that of original manufactured specifications.