Why Is My Dishwasher Loud?

A running dishwasher shouldn’t sound like a party. If you hear regular clanking, it may be time to play detective and get to the bottom of the problem. Dishwashers can make all kinds of sounds due to clogs, old age, broken parts, and user error. Let’s break down the seven most common reasons why your dishwasher is loud so it can clean in peace and quiet. 

1. Poor Dish Placement 

One of the biggest causes of a loud dishwasher is loose dishes. If you cram too many dishes into a dishwasher, they can clash against each other as the spray arm rinses them. A clanging noise is a big telltale sign that your dishes need rearranging. 

How to Fix It

Space the dishes out, making sure they fit snugly on the racks. Place larger cookware in the middle to keep them from hitting the sides. If you notice a heavier dish tilting forward, it might be worth cleaning it by hand.

2. Clogged Spray Arm

Spray arms send water around the dishwasher, but when they become plugged, the pressure from the blocked water can create a loud sound. 

How to Fix It

To fix this, check for mineral deposits, stray utensils, and debris. You can clean the spray arms using vinegar or make a paste of baking soda and let it sit on the buildup. Then, use a small wire to loosen clogs. 

3. Malfunctioning Drain Pump

Your dishwasher’s drain pump is an important part of the drainage system. If it fails to operate correctly, then you’ll hear loud grinding, buzzing, or squealing noises, and your dishwasher won’t drain well. 

How to Fix It

While cleaning the drainage system might help with this problem, if you have a malfunctioning drain pump, you’ll need to hire a technician to confirm the diagnosis and replace the pump to restore proper function.

4. Inlet Valve Issue

Water inlet valves can become finicky for several reasons. The small filter inside the inlet valve is prone to clogs from hard water sediment and the valve itself can wear down from the repetitive opening and closing during the dishwasher cycle. You might hear a loud screeching noise if the water inlet valve is plugged. 

How to Fix It

Since the inlet valve is usually located underneath the dishwasher, consider hiring a professional for the disassembly. If that doesn’t do the job, or there are signs of wear and tear, your pro can order the correct replacement inlet valve to fix the problem.

5. Worn Circulation Pump 

A loud buzzing or high-pitched sound emanating from your dishwasher might be an issue with the circulation pump. The bearings of your circulation pump can become worn out, leaving your dishes looking dirty after a cycle. 

How to Fix It

If you notice your dishes still have stuck-on food, then you might need to replace the circulation pump with the help of a knowledgeable professional. 

6. Broken Impeller

A pump impeller has fins that help propel water through the dishwasher’s spray arms. It also helps flush water during the drain process. 

How to Fix It

A propeller can break after years of working through chunks of food and other stubborn debris. This is not a DIY project and likely needs the help of a professional if you have to replace it. 

7. Loose Drain Hose

Sometimes, the drain hose that connects your dishwasher to the primary drain can become loose. Another issue: it may have been improperly installed in the first place. In this case, the hose moves around while your dishwasher drains, causing a loud noise. To spot this culprit see if your dishwasher is making a racket only when it's draining. 

How to Fix It

In most cases, you can use a pipe clamp, zip ties, or wire to secure the drain hose and prevent it from moving during the dishwasher cycle. 

When to Call a Pro

When you've tried the straightforward hacks to make your dishwasher quieter to no avail, it might be time to call in an expert. A dishwasher repair pro near you can troubleshoot your dishwasher and determine whether it needs repairing or if you need to replace the dishwasher entirely. Installing a new dishwasher costs between $1,000 and $1,500 on average.

How to Prevent Loud Dishwasher Noises

If your dishwasher is over 10 years old, then it may be time to replace it. However, a newer dishwasher is the perfect opportunity for you to implement some best practices to prevent future issues that lead to a loud dishwasher, including the following tips:

• Scrape off large food particles before loading.

• Always stack dishes and utensils in an orderly fashion.

• Avoid overloading your dishwasher.

• Use the recommended amount of detergent.

• Clean your dishwasher every three to six months.

• Run a vinegar rinse to remove hard minerals.

• Invest in a water softener.

• Repair your dishwasher as soon as problems arise.

• Operate the dishwasher periodically to prevent buildup.