Manitowoc SM50 series

Questions and Answers

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Brenda NicholsonAug 8, 2025
What to do if my Manitowoc SM50 Ice Maker runs but no ice is produced?
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  Richard HarveyAug 8, 2025
  If your Manitowoc Ice Maker is running but not producing ice, there might be several reasons: * Ensure the ice machine has a water supply. * Verify the incoming water pressure is within the range of 20-80 psi (1.4-5.5 bar). * Check if the spray nozzle is blocked with mineral buildup; if so, clean and sanitize the ice machine. * Confirm the ambient temperature is between 50°F and 110°F (10°C and 43°C). * Refer to thermistor diagnostics.
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David RoseAug 16, 2025
Why is the freeze cycle long and ice production low on my Manitowoc Ice Maker?
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  Kelsey PettyAug 16, 2025
  A long freeze cycle and low ice production in your Manitowoc Ice Maker can be due to several factors: * The water temperature might be too high. Connect the machine to a cold water supply and check the check valves in faucets and other equipment. * The condenser might be dirty. Clean the condenser. * The air temperature entering the condenser may be too high. Ensure it does not exceed 120°F (39°C). * The water inlet valve filter screen could be dirty. Remove the water inlet valve and clean the filter screen. * The water inlet valve might be stuck open or leaking. Turn off the ice machine; if water continues to enter, verify water pressure and replace the valve if necessary. * There might be a refrigeration problem. Refer to refrigeration diagnostics.
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Brandon StewartAug 23, 2025
How to troubleshoot a Manitowoc SM50 Ice Maker that will not harvest?
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  Ann HuertaAug 23, 2025
  If your Manitowoc Ice Maker is not harvesting, here are a few things you can check: * Verify cubes are present in the evaporator and the freeze time exceeds the freeze chart cycle time. * Observe the control board light: a steady light indicates normal thermistor operation. * Reset the ice machine. * Verify the water inlet valve is energized during the entire harvest cycle and water flow is normal. * Check for power at the hot gas valve.
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John RichardsonAug 30, 2025
Why is the ice quality poor in my Manitowoc SM50?
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  ohendricksAug 30, 2025
  Poor ice quality in your Manitowoc Ice Maker, such as shallow, incomplete, or white cubes, can stem from: * A dirty ice machine. Clean and sanitize it. * Poor water filtration. Replace the filter. * An improperly working water softener (if applicable). Repair the water softener. * Poor incoming water quality. Contact a qualified company to test the water and recommend appropriate filters.

Summary

Safety and Procedural Notices

Safety Notice Explanations

Explains the meaning and importance of Warning, Caution, and Important notices found throughout the handbook for safe operation.

Procedural Notice Explanations

Clarifies the purpose of Procedural Notices, including Important notes and general Notes, to aid in performing tasks.

General Information and Model Identification

Model Numbers and Identification

Details how to identify Manitowoc ice machine models by understanding their series, cube size, and condenser type.

Component Identification Diagrams

Visual diagrams illustrating and labeling key components within the evaporator compartment and overall machine structure.

Ice Machine Warranty Information

Outlines the terms of commercial and residential warranty coverage, including parts, labor, and exclusions.

Installation and Setup Procedures

Ice Machine Installation Guidelines

Specifies environmental and physical criteria for selecting an appropriate installation location for the ice machine.

Leveling and Electrical;Water Requirements

Provides instructions on leveling the ice machine and lists the necessary electrical and water supply requirements for installation.

Maintenance and Cleaning Procedures

Routine Maintenance Tasks

Covers essential maintenance like inspecting fittings, cleaning the exterior, and cleaning the condenser for optimal performance.

Interior Cleaning and Sanitizing

Details the step-by-step process for thoroughly cleaning and sanitizing the internal parts of the ice machine for hygiene.

Service Removal and Winterization

Outlines the procedures for safely removing the ice machine from service or preparing it for extended periods of non-use or freezing temperatures.

Operation and Performance Monitoring

Ice Making Cycle Operations

Explains the sequence of operations including start-up, freeze, harvest, and automatic shut-off for different model series.

Operational Checks and Adjustments

Describes how to perform water level checks, ice thickness adjustments, and other operational verification steps.

Troubleshooting and Diagnostics

Diagnosing Machine Operation Issues

Provides systematic troubleshooting guides for common problems like the machine not running or control circuitry malfunctions.

Refrigeration System Diagnostics

Details procedures for analyzing pressures, temperatures, and ice formation patterns for diagnosing refrigeration problems.

Safety Limit Troubleshooting

Explains the function of safety limits, how to identify triggered limits, and the steps to take when the machine stops due to a safety condition.

Component-Specific Troubleshooting

Offers targeted troubleshooting steps for specific components like the compressor, valves, and thermostats across different ice machine models.