Washing Machine Making Knocking Noise

Introduction

A knocking noise coming from your washing machine can be alarming and indicate a problem that needs attention. This noise often occurs during the spin cycle but can also happen during the wash cycle. Ignoring a knocking sound could lead to further damage to your washing machine, potentially resulting in costly repairs or even the need for a replacement. Addressing this issue promptly can save you money and extend the life of your appliance.

Common Causes of Washing Machine Making Knocking Noise

Here are some of the most common reasons your washing machine might be making a knocking noise:

Unbalanced Load: Clothes clumped together can cause the machine to become unbalanced.
Loose Items: Coins, buttons, or other small objects stuck between the drum and the outer tub.
Worn Drum Bearings: Bearings support the drum; wear and tear can cause them to make noise.
Damaged Suspension Rods: These rods help stabilize the drum during the spin cycle.
Weakened Shock Absorbers: Similar to suspension rods, these absorb vibrations.
Faulty Motor Coupling: Connects the motor to the transmission; can wear out over time.
Broken Drive Pulley: Helps to rotate the drum; cracks or damage can cause noise.
Shipping Bolts Still Attached: If the machine is new, check if shipping bolts are removed.
Foreign Object in Drain Pump: Obstructions can cause the pump to make noises during operation.

Symptoms Checklist

Use this checklist to help pinpoint the cause of the knocking noise:

Knocking sound is loudest during the spin cycle.
The washing machine shakes violently.
Knocking occurs only with large loads.
The machine makes a scraping sound in addition to the knocking.
You find small objects inside the drum after washing.
The washing machine walks or moves during operation.
The noise started suddenly after a specific wash load.

How to Fix Washing Machine Making Knocking Noise Step-by-Step Guide

Follow these steps to troubleshoot and potentially fix the knocking noise:

Unplug the Washing Machine: For safety, disconnect the appliance from the power source.
Check for an Unbalanced Load: Open the washer and redistribute the clothes evenly around the drum. Try to wash items of similar weight together.
Inspect for Loose Items: Check the drum, the rubber seal around the door, and the drain pump filter for any foreign objects. Clean out any debris.
Level the Washing Machine: Use a level to ensure the machine is sitting flat on the floor. Adjust the legs as needed until it’s perfectly level.
Check Suspension Rods (if accessible): If your machine has visible suspension rods, inspect them for damage or looseness. If they’re easily accessible, gently push down on the drum to see if any rod is weaker than others.
Inspect Shock Absorbers (if accessible): Similar to the suspension rods, check the shock absorbers for leaks or damage. These are typically located at the bottom of the machine.
Check the Drain Pump Filter: Locate the drain pump (usually at the bottom front of the machine behind a small access panel). Remove the filter and clean it thoroughly.
Listen Carefully: Run a short wash cycle (with no clothes) and try to pinpoint where the noise is coming from. This can help you narrow down the cause.
Inspect the Drive Pulley: (Requires some disassembly and should only be attempted if you’re comfortable). Check the drive pulley for cracks or damage.
Check the Motor Coupling: (Requires some disassembly and should only be attempted if you’re comfortable). Examine the motor coupling for signs of wear or breakage.
Ensure Shipping Bolts are Removed: If the machine is new, double-check that the shipping bolts (used to stabilize the drum during transport) have been removed.
Run a Cleaning Cycle: Mineral buildup can sometimes cause noise. Run a cleaning cycle with a washing machine cleaner to remove any deposits.
Check the Water Inlet Valve: Sometimes, a rattling noise can mimic a knocking sound. Ensure the water inlet valve is securely attached and functioning properly.

Fix the Issue Without Buying Parts

Here are some free methods to try before considering part replacements:

Reset the Washing Machine: Unplug the machine for 1-2 minutes, then plug it back in. This can sometimes reset the control board and resolve minor issues.
Deep Cleaning: Run a cycle with white vinegar and baking soda to clean the drum and remove residue.
Recalibration (if applicable): Some machines have a recalibration mode. Consult your owner’s manual for instructions.
Visual Inspection: Carefully inspect all visible parts for obvious damage or wear.
Regular Maintenance: Clean the lint trap and wipe down the machine regularly to prevent buildup.

When Replacement Might Be Necessary

If the knocking noise persists after trying the above steps, it might indicate a more serious problem requiring part replacement. Common parts that fail include the drum bearings (expensive to replace, $200-$500 including labor), suspension rods ($50-$150 including labor), and the motor coupling ($30-$80 including labor). If the cost of repairs exceeds half the price of a new machine, consider replacing it.

Safety Warning

Always unplug the washing machine before attempting any repairs.
Avoid working on electrical components with wet hands or on a wet floor.
If you are uncomfortable with any of the steps, consult a qualified appliance repair technician.
Be careful when lifting or moving the washing machine, as it can be heavy.
Wear gloves to protect your hands from sharp edges or debris.

Tools You May Need

Level
Screwdrivers (Phillips and flathead)
Pliers
Wrench
Gloves
Shop Towels
Flashlight

FAQ

Here are some frequently asked questions about washing machine knocking noises:

Q: Why is my washing machine knocking only during the spin cycle? A: This often indicates an unbalanced load, worn drum bearings, or damaged suspension rods.
Q: Can a small object cause a loud knocking noise? A: Yes, even a small coin or button can create a significant knocking sound if it gets lodged between the drum and outer tub.
Q: How do I know if my drum bearings are bad? A: If the knocking is accompanied by a grinding sound, and the drum has excessive play (movement), the bearings are likely worn.
Q: Is it safe to use my washing machine if it’s making a knocking noise? A: It’s best to avoid using the machine until you’ve identified and addressed the cause of the noise to prevent further damage.

Conclusion

A washing machine making a knocking noise can be frustrating, but often, the issue is easily resolved with a bit of troubleshooting. Start with the simple solutions like checking for unbalanced loads and loose items. If the problem persists, follow the steps outlined in this guide. Remember to prioritize safety and unplug the machine before attempting any repairs. Before calling a technician, you can potentially save money and get your washing machine back in working order.