The Ultimate Troubleshooting Guide for Manitowoc Ice Machine

When it comes to commercial ice production, few names stand out more than Manitowoc. The brand has built a solid reputation for delivering high-quality, reliable ice machines used in various industries, from restaurants and bars to hotels, hospitals, and more. These machines are known for their efficiency, durability, and ice production capabilities. However, like any complex piece of equipment, Manitowoc ice machines can experience technical issues over time, ranging from inconsistent ice production to complete system failure. Knowing how to troubleshoot these problems can save you from expensive repairs and unnecessary downtime.
In this guide, we’ll walk you through the most common issues faced by Manitowoc ice machines, provide troubleshooting steps, and discuss essential Manitowoc ice machine parts that are integral to the proper functioning of these machines. Whether you're a seasoned technician or a business owner looking to maintain your machine, this ultimate guide will help you keep your Manitowoc ice machine running smoothly.

Understanding Manitowoc Ice Machines & Its Key Components

We know that Manitowoc commercial ice maker are known for their high-quality and reliable ice production. They offer a variety of ice machine models, each designed for specific applications and production capacities. Here are the common types of ice machines Manitowoc:

• Modular Ice Machines

• Undercounter Ice Machines

• Countertop Ice Machines

Look at our Commercial Ice Machine Buyer Guide, which provides essential information and helpful tips to assist you in making the right decision when purchasing an ice machine for your business.

Common ice machine Manitowoc replacement parts

When it comes to Manitowoc ice machines, there are several common replacement parts that may be needed over time to ensure proper functioning and maintenance. Here are some of the commonly replaced Manitowoc ice machine parts:

Check out this video for Manitowoc Ice Machine Troubleshooting:

Common issues with Ice Machines Manitowoc

Now that you know what are the common Manitowoc ice machine parts that require replacement. Let us find out the most common problems that can occur with these ice machines and Manitowoc ice machine troubleshooting tips and tricks:

 Manitowoc ice maker not making enough ice

If your Manitowoc ice maker not making enough ice at all, there are a few potential causes to consider:

• Power Supply: Check if the machine is receiving power by ensuring it is properly plugged in and the circuit breaker is not tripped.

• Water Supply: Ensure that the water supply to the machine is sufficient and not blocked. Check the water inlet valve for any clogs or restrictions.

• Water Filter: A clogged or dirty water filter can restrict water flow and affect ice production. Check the filter and clean or replace it if necessary.

• Evaporator Plate: The evaporator plate, which is responsible for freezing water, may be dirty or covered in scale. Inspect the plate and clean it using a Manitowoc-approved nickel-safe cleaner.

• Harvest Cycle: If the machine is stuck in the harvest cycle, it will not produce new ice. Check the control board or the harvest switch for any malfunctions.

 Ice machine not working, restarts when switched off, and on again

If your ice machine stopped working but restarts when you turn it off and on again, the issue could be related to:

• Control Board: The control board may be experiencing intermittent malfunctions if ice machine running but not making ice. Inspect the control board for any loose connections, damaged components, or signs of overheating. Consider replacing the control board if necessary.

• Electrical Supply: Check the electrical supply to the ice machine. Ensure that the voltage and wiring connections are correct and stable. Inconsistent power supply can cause the machine to shut off unexpectedly.

• Overheating: The ice machine may be overheating, triggering a safety feature that shuts it down temporarily. Check the condenser and evaporator coils for excessive dirt or debris buildup. Clean the coils and ensure proper airflow around the unit.

• Sensor Issues: Faulty sensors, such as the water level sensor or the ice thickness probe, can cause the machine to shut down. Inspect the sensors for any damage or misalignment. Clean or replace the sensors as needed.

Low ice production 

If your Manitowoc ice machine is not making ice just running water or producing ice, but the quantity is lower than expected, consider the following possibilities:

• Water Supply and Filter: Check the water supply pressure and ensure the water filter is clean. Low water pressure or a clogged filter can result in reduced ice production.

• Water Inlet Valve: Inspect the water inlet valve for any restrictions or damage. It may need cleaning or replacement if it is not allowing enough water into the machine.

• Condenser: A dirty or malfunctioning condenser can hinder the ice-making process. Clean the condenser coils and ensure proper airflow around the unit.

• Harvest Cycle Issues: If the harvest cycle is not functioning properly, it can lead to lower ice production. Check the control board, harvest switch, or harvest timer for any faults.

If you have a Scotsman ice machine, it's recommended to familiarize yourself with the Scotsman ice machine troubleshooting guide, as it can help you quickly identify and resolve any issues that may arise with your machine.

Mold in Manitowoc ice machines

The growth of mold in Manitowoc ice machines can be a result of poor maintenance or improper cleaning. To address this issue:

• Cleaning and Sanitizing: Follow the manufacturer's instructions to regularly clean and sanitize the ice machine. Use a Manitowoc-approved cleaner and sanitizer to eliminate mold and bacteria.

• Check out this Manitowoc ice machine cleaning guide for more information

• Water Filtration: Ensure that the water filtration system is properly installed and maintained. A good filtration system will help reduce contaminants and inhibit mold growth.

• Regular Inspections: Regularly inspect the ice machine for any signs of mold or mildew. Pay attention to the evaporator plate, water distribution components, and the interior of the machine. If you notice mold, clean the affected areas thoroughly.

• Proper Ventilation: Ensure that the ice machine has proper ventilation and airflow. Poor ventilation can contribute to moisture buildup and mold growth. Make sure the machine is not placed in a tight or enclosed space.

Producing thin or hollow ice 

If your Manitowoc commercial ice machine is not making ice or producing thin or hollow ice cubes, the following factors could be the cause:

• Water Supply: Insufficient water flow or low water pressure can lead to the formation of thin or hollow ice cubes. Check the water supply and ensure proper pressure.

• Water Inlet Valve: If the water inlet valve is not opening fully or is clogged, it can restrict the flow of water into the machine, resulting in thin ice cubes. Clean or replace the valve as needed.

• Water Distribution Tube: The water distribution tube may be clogged or misaligned, leading to uneven water distribution and thin ice formation. Clean or adjust the tube if necessary.

• Water Level: Ensure that the water level is correct within the machine. Adjust the water level sensor if needed, following the manufacturer's instructions.

Manitowoc Ice Machine Leaking Water  

If your Manitowoc commercial ice maker is leaking water outside the machine, there are a few possible causes:

• Water Inlet Valve: Check the water inlet valve for any leaks or loose connections. Tighten any loose fittings or replace the valve if necessary.

• Water Supply Line: Inspect the water supply line for any leaks or cracks. If you find any issues, replace the damaged line.

• Drain Line: Ensure that the drain line is properly connected and not clogged. Clean or clear any obstructions in the drain line.

• Ice Bin: If the manitowoc ice bin is overfilled or not aligned properly, it can cause water to overflow and leak outside the machine. Adjust the ice level or realign the bin to prevent leaks.

Manitowoc Ice Thickness Probe Problems

If you're experiencing problems with the ice thickness probe on your Manitowoc ice machine, consider the following troubleshooting steps:

• Calibration: Ensure that the ice thickness probe is calibrated correctly. Follow the manufacturer's instructions to adjust the probe to the desired ice thickness.

• Cleanliness: Check if the ice thickness probe is clean and free from any debris or mineral buildup. To prevent mineral buildup and scale on an ice machine clean the probe using a soft cloth or brush, and if necessary, a Manitowoc-approved cleaner.

• Alignment: Verify that the ice thickness probe is properly aligned with the evaporator plate. Adjust the position of the probe if it is not in the correct location.

• Sensor Condition: Inspect the ice thickness probe for any signs of damage or wear. If the probe is damaged, replace it with a new one following the manufacturer's instructions.

Manitowoc Ice Machine Not Making Ice, Just Running Water

If your Manitowoc ice machine is only running water without making ice, it could be due to several factors. Understanding these potential issues will help you troubleshoot effectively.

• Water Supply Problems: Ensure the water supply valve is open and not clogged. A malfunctioning valve will restrict the water flow to the evaporator, which is essential for ice production.

• Water Pump Failure: The water pump circulates water onto the evaporator. If it’s malfunctioning or clogged, water will not reach the evaporator, preventing ice formation.

• Temperature Issues: The temperature of the water may not be low enough to freeze. A faulty thermostat or temperature sensor may fail to signal the system to lower the temperature for ice formation.

• Compressor Malfunction: The compressor is responsible for circulating refrigerant to the evaporator, cooling the water to form ice. If it’s damaged or inefficient, the machine won’t be able to freeze the water.

Solution: Check for proper water flow and inspect the water valve. Clean the water pump to ensure it’s functioning properly. Test and replace the thermostat if necessary. If the compressor is the issue, a professional technician should inspect and repair it.

Manitowoc Ice Machine Not Dropping Ice

When your Manitowoc ice machine produces ice but fails to drop it into the storage bin, the following issues could be at play:

• Frozen Evaporator: Mineral deposits or debris buildup on the evaporator can cause the ice to stick. If the evaporator freezes over, the ice may not fall off as expected.

• Malfunctioning Harvest Cycle: The harvest cycle is the process in which ice is released from the evaporator and falls into the bin. A defective motor or gear in the ice maker can prevent the ice from dropping.

• Faulty Thermostat or Probe: A malfunctioning thermostat or ice thickness probe may not signal the system to initiate the harvest cycle. The probe could be giving incorrect readings, preventing the machine from releasing the ice.

• Excessive Ice Thickness: If the ice thickness probe isn’t set properly, it may cause the ice to be too thick, preventing it from falling off the evaporator.

Solution: Clean the evaporator to remove debris. Inspect the ice maker motor and gears for functionality. Test the thermostat and probe for correct readings, and ensure the ice thickness is calibrated properly.

Manitowoc Ice Machine Not Draining

If your Manitowoc ice machine isn’t draining properly, it can lead to water buildup inside the machine, causing damage and poor performance. Here’s how to troubleshoot:

• Clogged Drain Line: A blocked drain line is one of the most common causes of drainage problems. Over time, mineral buildup, algae, or debris can clog the line, preventing water from draining out.

• Faulty Drain Pump: If the drain pump isn’t working, water will be unable to leave the machine. The pump may be clogged, or the motor may have failed.

• Incorrect Drain Placement: If the drain line is positioned incorrectly or there is an issue with the slope, water may not flow properly out of the machine.

• Overflowing Ice Bin: If the ice bin is overfilled or the machine doesn’t drain properly, water can overflow and cause a mess.

Solution: Inspect and clean the drain line to remove any blockages. Test the drain pump for proper operation and replace if needed. Ensure the drain line is positioned properly and at the correct angle.

Manitowoc Ice Machine Display Not Working

A non-functional display on your Manitowoc ice machine can be frustrating, especially when you rely on it for diagnostics and control. Several factors may cause this:

• Power Supply Issues: The display may not turn on if the machine isn’t receiving power. Check the power source, ensure the plug is secure, and inspect any fuses or circuit breakers.

• Control Board Failure: The control board is responsible for sending signals to the display. If it malfunctions, the display may remain blank.

• Loose or Damaged Wiring: Loose connections or damaged wires can disrupt communication between the control board and the display, causing it to stop working.

• Electrical Overload: Power surges or electrical issues can cause the display to stop functioning.

Solution: Check for power supply issues and reset any tripped breakers. Inspect the control board for damage and replace it if necessary. Tighten any loose wiring connections.

Manitowoc Ice Machine Not Making Ice After Cleaning

If your Manitowoc ice machine isn’t making ice after cleaning, it could be due to improper cleaning or other underlying issues:

• Residual Cleaning Solution: If the cleaning solution wasn’t thoroughly rinsed, it may be affecting the machine’s ability to make ice. Ensure all cleaning agents are properly flushed out.

• Evaporator Issues: Cleaning the machine may have inadvertently caused a blockage or damage to the evaporator, preventing the water from freezing properly.

• Water Supply Problems: Cleaning may have disturbed the water supply system, causing low water flow or a malfunctioning valve.

• Temperature Sensor Issues: A malfunctioning thermostat or sensor could cause the system to misread temperatures, preventing ice production.

Solution: Thoroughly rinse the machine after cleaning to remove all cleaning agents. Inspect the evaporator, water valve, and temperature sensors for issues.

Manitowoc Ice Machine Not Turning On

When your Manitowoc ice machine won’t turn on, you need to check for common electrical or mechanical issues:

• Power Supply: Ensure the machine is plugged in and receiving power. Check the power cord, plug, and any circuit breakers or fuses.

• Blown Fuse: If the fuse inside the machine has blown, it can prevent the system from starting. Replace the fuse if necessary.

• Control Board Malfunction: The control board acts as the brain of the machine. A malfunctioning control board can prevent the machine from turning on.

• Start Capacitor Failure: The start capacitor helps the compressor initiate. If the capacitor fails, the machine may not turn on.

Solution: Check for power issues and replace the fuse if needed. Inspect the control board and start capacitors, and replace them if necessary.

Manitowoc Ice Machine Power Button Not Working

If the power button isn’t responding, it can prevent your Manitowoc ice machine from turning on:

• Power Supply Issues: Ensure the machine is properly plugged in and receiving power. Check the power cord and any circuit breakers.

• Button Malfunction: The power button itself may be faulty or unresponsive due to wear and tear.

• Control Board Issue: If the control board is malfunctioning, it may not be recognizing the button press, preventing the machine from turning on.

Solution: Inspect the power supply and replace any faulty power buttons or control board components.

Manitowoc Ice Machine Troubleshooting Error Codes

Manitowoc ice machines display error codes to indicate specific issues with the machine, allowing for easier troubleshooting. Understanding these codes is key to fixing the problem.

• Error Code 1 – Water Supply Issue: This code usually signals that the water supply is interrupted or not flowing properly. It could be a problem with the water valve or water pressure.

• Error Code 2 – Ice Thickness Probe Issue: If the ice thickness probe is malfunctioning or obstructed, it can cause inaccurate readings, leading to errors.

• Error Code 3 – Refrigerant Issues: This code typically indicates that the refrigerant level is either too high or too low. A refrigerant leak or insufficient refrigerant can lead to improper ice formation.

• Error Code 4 – Water Temperature Problem: If the water entering the machine is too warm, the system will struggle to make ice. This could indicate a problem with the water inlet valve or a faulty thermostat.

Solution: Refer to the machine’s user manual for a list of error codes. Resolve the water supply issues, clean or replace the ice thickness probe, and address refrigerant or water temperature problems.

How to reset manitowoc ice machine?

Sometimes just a simple Manitowoc ice machine reset will resolve issues. Here is how to reset ice machine:

• Unplug the machine from the power outlet to turn it off.

• Allow around 10 seconds.

• Plug the machine back in and hit the power switch ON button once more.

• If a blue light emerges, the unit has been successfully reset.

Preventative & Maintenance Tips

When it comes to keeping your Manitowoc ice machines running smoothly, preventative maintenance is key. By taking proactive steps to care for and maintain your equipment, you can avoid costly breakdowns and ensure that your ice machines continue to produce clean and refreshing ice. Let us look at some of the maintain tips:

1. Clean the Ice Machine Regularly

Regular cleaning is a fundamental aspect of preventative maintenance. To ensure hygienic ice production and prevent the buildup of dirt and scaleclean the ice machine regularly. Here are the steps on how to clean Manitowoc ice machine regularly:

• Begin by unplugging the machine and shutting off the water supply.

• Empty the manitowoc ice bin and discard any remaining ice.

• Use a mild, non-abrasive cleaner to wipe down the interior and exterior surfaces of the machine, including the ice bin and ice-making components.

• Pay special attention to the evaporator plate, water trough, and water distribution tube. Clean these areas thoroughly to remove any mineral deposits or scale buildup.

• Rinse all surfaces with clean water and dry them with a soft cloth.

• Once the machine is dry, plug it back in and restart the water supply.

• Dispose of the first batch of ice produced after cleaning to ensure freshness.

2. Inspect and Replace Water Filters

Clean water is vital for producing high-quality ice. Regularly inspect the water filters and replace them as recommended by the manufacturer. This will prevent contaminants from entering the ice-making system and ensure that your ice remains pure and free from any off-flavors or odors.

3. Check and Clean the Condenser

The condenser is responsible for dissipating heat from the ice machine. If it becomes clogged with dust and debris, it can impede the cooling process and strain the machine. Follow these steps to maintain a clean condenser:

• Turn off the machine and unplug it from the power source.

• Locate the condenser unit, typically located on the back or side of the ice machine.

• Use a soft brush or vacuum cleaner to remove dust and debris from the condenser fins. Be gentle to avoid damaging the delicate fins.

• Once the condenser is clean, plug the machine back in and restart it.

4. Monitor Ice Production and Quality

Regularly monitor the ice production and quality to identify any potential issues early on. Keep an eye out for:

• Reduced ice production

• Thin or misshapen ice cubes

• Unusual noises during the ice-making process

• Off-flavors or odors in the ice

If you notice any of these signs, it may indicate a problem that requires attention. Addressing issues promptly can help prevent further damage and ensure continuous ice production.

5. Schedule Professional Maintenance

While regular cleaning and inspections can go a long way in preventing issues, it's also essential to schedule professional maintenance for your Manitowoc ice machines. A professional technician will have the expertise to perform in-depth checks, address any underlying problems, and provide specialized care for your equipment. Consider setting up a maintenance schedule with a reputable service provider to ensure your machines receive the attention they need.

Troubleshooting your Manitowoc ice machine can save you time and money by identifying and resolving issues before they become major problems. By following the steps outlined in this guide, you can quickly and easily diagnose and fix common issues. Remember to always refer to yourManitowoc ice machine service manual for specific instructions and to take safety precautions when working with electrical or mechanical components. 

FAQs

How long do Manitowoc ice machines last?

Manitowoc ice machines can typically last between 10 to 20 years, depending on usage, maintenance, and environmental factors.

What is the Manitowoc ice machine price?

The price range for Manitowoc ice machines can start from around $2,000 for smaller models with basic features and can go up to $20,000 or more for larger, high-capacity machines with advanced features and accessories.

What is the common reason the ice maker not working?

A common reason for an ice maker not working is a clogged water line or inlet valve, which can be caused by mineral deposits or a malfunctioning component.

How long is the Manitowoc freeze cycle?

The ice machine freezing up typically ranges from 15 to 20 minutes, but it can vary depending on the specific model and ice production capacity.

How to service a Manitowoc ice machine?

To service a Manitowoc ice machine, it is recommended to follow the manufacturer's guidelines, which generally involve regular cleaning, descaling, and inspecting key components like the evaporator, water system, and condenser. Professional assistance may be required for more complex maintenance tasks.