Solving the Puzzle: Ice Maker Making Knocking Noise – Causes & Fixes

Are you annoyed by the knocking sound coming from your ice maker? Is the noise making your life unbearable? We are here to help you solve the problem. An ice maker making knocking noise can be caused by various reasons ranging from blocked water lines to faulty valves and components. It can be fixed, saving you both money and frustration. In this article, we will help you understand the mechanism behind the ice maker and explore the common causes of knocking noise. We will also provide you with effective solutions to fix the issue once and for all.

Key Takeaways:

  • An ice maker making knocking noise can be frustrating and annoying
  • There are common causes of knocking noise ranging from water supply problems to ice buildup
  • Understanding the ice maker mechanism is essential in troubleshooting and fixing the issue
  • DIY methods can solve the knocking noise problem, but professional assistance is also available
  • Maintenance tips can prevent knocking noise in the future

Understanding the Ice Maker Mechanism

Before diving into possible causes for the knocking noise in your ice maker, it’s essential to understand how it operates. Knowing the key components involved and their functions can help pinpoint the problem and find an appropriate fix.

An ice maker works by using an electric motor to turn a gearbox and drive a series of cams and electrical switches, which control the water supply and ice ejection. When ice cubes are ready, a heating coil underneath the ice tray melts the bottom of the ice cubes, freeing them from the mold and letting them fall into the bin below.

If the ice maker is malfunctioning, it can cause various noises, including knocking or rattling. Below, we will explore the most likely components related to the noise and how to troubleshoot them.

Ice Maker Cam and Gears

The cam and gears in an ice maker control when the ice maker fills with water and when it dumps out the ice. If the cam and gears become worn, they may not work effectively, causing a knocking or rattling sound. To troubleshoot this issue, open the ice maker and examine the cam and gears for any visible signs of damage. If the components are worn or broken, replace them with new ones.

Ice Maker Water Valve

The water valve is responsible for supplying water to the ice maker. When the valve is defective or partially clogged, it can cause knocking or rattling sounds. To check the valve, turn off the water supply and remove the water line from the valve. Place a container under the valve and turn on the water supply briefly to flush out any debris. If the noise persists, the valve may need to be replaced.

Ice Maker Fan Blade

The fan blade in an ice maker circulates air over the coils to help freeze water into ice. If the fan blade becomes loose or damaged, it can lead to knocking noises. Inspect the fan blade for any visible damage and make sure it’s securely attached to the motor shaft. If necessary, tighten or replace the fan blade.

Ice Maker Motor

The electric motor is the heart of an ice maker, and if it’s malfunctioning, it can cause various noises, including knocking or rattling. To diagnose a motor issue, turn off the ice maker, remove the cover, and power on the unit. If there is no sound, the motor may need to be replaced. However, if the issue persists, other components may be contributing to the noise.

In the next section, we will explore common causes of ice maker knocking noises and how to fix them.

Common Causes of Ice Maker Knocking Noise

If you’re hearing knocking or banging noises coming from your ice maker, several factors might be at play. Here are some of the most common causes behind this issue:

Ice Maker Knocking Problem

One potential cause of knocking noises is an ice maker that’s not level. If your ice maker isn’t sitting on an even surface, it can cause the machine to move or vibrate, leading to knocking or banging sounds. Another cause could be loose screws or mounting bolts that need to be tightened.

Ice Maker Banging Noise

If you hear a loud banging noise when your ice maker drops ice into the bin, it’s likely due to a mechanical issue. One possibility is that the ice maker’s ejector blade has become stuck, causing it to hit the ice maker’s chassis or other parts. Another reason could be a defective motor or faulty gearbox.


Cause of Knocking NoiseSymptoms
Ice Maker Not LevelUneven surface, loose screws or mounting bolts
Stuck Ejector BladeBanging noise when ice drops into bin
Defective Motor or GearboxBanging or grinding noise

It’s important to identify the root cause of the knocking noise in your ice maker in order to resolve the issue effectively. Next, we’ll discuss steps to fix water supply issues that could be causing the noise.

Fixing Water Supply Issues

If your ice maker knocking noise is caused by a water supply issue, it’s essential to thoroughly troubleshoot the system before starting any repairs. Here are the steps to follow:

  1. Check the water line: First, ensure that the water line supplying the ice maker is securely connected and free of kinks or bends. If there are any issues, gently straighten the line to allow for uninterrupted water flow.
  2. Inspect the water pressure: Low water pressure can lead to knocking noises in an ice maker. To check the water pressure, locate the shut-off valve for the water supply line to the fridge and turn it off. Then, turn on a nearby faucet to drain the remaining water. Re-open the valve and observe the flow of water into the ice maker. If the pressure is still low, it may be necessary to install a water pressure regulator to resolve the problem.
  3. Replace damaged parts: If the water line or any other component of the ice maker is damaged, it may need to be replaced. Refer to your ice maker’s manual for specific instructions on part replacement. Most components can be easily ordered online or purchased from a local appliance store.

Tip: Always turn off your ice maker and unplug the fridge before attempting any repairs.

By following these steps, you can effectively address water supply problems that may be causing loud knocking noises in your ice maker.

Addressing Faulty Valves and Parts

ice maker repair

If you have ruled out water supply issues as the cause of your ice maker knocking noise, it’s time to examine the valves and components. Faulty valves or worn-out parts can also lead to knocking or rattling noises in your ice maker.

Important note: Before attempting any repairs, make sure to disconnect your ice maker from the power source and turn off the water supply.

Step 1: Inspect the valves and components to check for any noticeable damage or wear. Look for loose connections, cracks, or leaks that could be causing the noise.

Step 2: If you have identified a faulty valve or component, it may need to be replaced. Consult your ice maker’s manual or contact the manufacturer for guidance on finding and purchasing the correct part.

PartTypical Replacement Cost
Water Inlet Valve$45 – $65
Evaporator Fan Motor$60 – $120
Thermostat$25 – $85

Step 3: Once you have the replacement part, carefully install it as per the manufacturer’s instructions. Make sure to reassemble all parts properly and securely.

Step 4: Reconnect the ice maker to the power source and water supply, and turn it back on. Test your ice maker to see if the knocking noise has been resolved.

If you are unsure about replacing any parts or troubleshooting the issue, seek assistance from a professional technician.

Expert Tip:

“Regular maintenance, such as cleaning and replacing worn-out components, can help extend the lifespan of your ice maker and prevent potential issues like knocking noises.”

Eliminating Ice Buildup

ice maker knocking problem

If your ice maker is making a knocking noise, ice buildup might be the reason behind it. Ice can accumulate around the evaporator fan motor or get caught in the blades of the fan, causing a loud knocking noise.

You can start by unplugging the unit and removing excess ice using a plastic scraper. A table knife can scratch or damage the inner lining of the unit, so avoid using that. Once the ice is removed, restart the ice maker and check if the knocking noise is gone.

If the knocking noise persists, you may need to remove the evaporator cover and clean the fan using a soft-bristled brush. As ice maker models vary, refer to the manufacturer’s instructions for removing the cover and cleaning the fan. Be cautious not to damage the fan blade as it can increase noise levels.

To prevent future ice buildup, ensure the ice maker is not overfilling. Ice cubes stuck together in the bin can obstruct the operation of the ice maker. Check the water inlet valve, and ensure it is working correctly. A defective valve can cause an excess amount of water to enter the ice maker and contribute to the ice buildup problem.

“Ice buildup can be a common problem in ice makers, but it can be solved effectively with some simple troubleshooting steps.”

Professional Assistance and Maintenance Tips

ice maker maintenance

If the knocking noise in your ice maker persists despite trying the DIY solutions, you might consider reaching out to a professional repair service. Sometimes, the cause of the noise can be more complex and beyond the scope of a simple fix. A professional technician can diagnose the issue and provide a suitable solution.

Additionally, regular maintenance and cleaning of your ice maker can prevent knocking noises from forming in the first place. Here are some tips to keep your ice maker in good condition:

  • Regularly clean the ice maker and its components, including the ice bin and water supply line.
  • Replace the water filter every six months to ensure a steady flow of clean water.
  • Check the water pressure going to the ice maker regularly, and adjust if necessary.
  • Inspect the water supply line for any kinks or damage and replace if needed.
  • Ensure the ice maker is level and stabilized to reduce vibration.

By following these maintenance tips and troubleshooting the knocking noise yourself or with the help of a professional, you can keep your ice maker running smoothly and quietly.

Other Noises from the Ice Maker

noises from ice maker

While a knocking noise may be the most common sound you hear from your ice maker, there are other noises that could indicate an issue. Understanding these noises can help you identify and troubleshoot problems before they worsen.

Whirring or Humming

If you hear a constant whirring or humming sound coming from your ice maker, it could indicate a problem with the motor or fan. Check to see if any parts are loose or damaged, and clean the fan blades to ensure they are running smoothly. If the issue persists, it may be necessary to replace these components.

Grinding or Squeaking

These types of noises could point to a problem with the gears or other moving parts. Inspect the ice maker for signs of wear and tear, and lubricate any parts that may be causing friction. If the noise continues, it may be time to replace these components.


A clicking noise could indicate an issue with the electrical supply or a faulty relay switch. Check the power cord and outlet for any damage or loose connections, and replace any worn-out switches.

By understanding the different noises that your ice maker can make, you can stay on top of maintenance and repairs to prevent bigger issues down the line.


In conclusion, a knocking noise in your ice maker can be caused by various factors, including water supply problems, faulty valves or parts, and ice buildup. It’s important to identify and address the issue promptly to prevent further damage and ensure a quieter user experience.

If you’re unable to troubleshoot the problem on your own, seeking professional assistance is highly recommended. Regular maintenance and cleaning can also help prevent knocking noises and keep your ice maker running smoothly.

Remember, a noisy ice maker doesn’t have to be a permanent annoyance. With the right approach and some basic knowledge, you can eliminate the knocking noise and enjoy perfectly chilled drinks without any distractions.


What could be causing my ice maker to make a knocking noise?

The knocking noise in your ice maker can be caused by various factors, such as water supply problems, faulty valves or parts, ice buildup, or worn-out components.

How can I fix water supply issues that are causing the knocking noise?

To troubleshoot and fix water supply problems, you can start by checking the water line for any clogs or leaks, ensuring proper water pressure, and replacing any damaged parts if necessary.

What should I do if the knocking noise is caused by faulty valves or worn-out components?

If faulty valves or worn-out components are the culprits behind the knocking noise, you can try inspecting these parts, replacing them if needed, and ensuring proper installation to resolve the issue.

How can I eliminate ice buildup to get rid of the knocking noise?

To eliminate ice buildup, you can use methods like defrosting your ice maker, removing excess ice, and implementing preventive measures to avoid future buildup.

Should I seek professional assistance if the DIY methods don’t work?

If the DIY methods don’t solve the knocking noise issue or if you prefer professional help, it’s recommended to seek expert assistance to ensure a proper resolution. Additionally, we will provide maintenance tips to keep your ice maker running smoothly and silently.

Are there any other noises I should be aware of from my ice maker?

While knocking noises are a common concern, there may be other sounds coming from your ice maker. We will briefly touch upon different noises you might encounter and their potential causes.

Why is it important to address a knocking noise in my ice maker?

It’s important to address a knocking noise in your ice maker to ensure a quieter and more enjoyable user experience. Ignoring the issue can lead to further damage or malfunctioning of the ice maker.