Top Reasons Dishwashers Make Strange Noises

Opening Hook

It was 10 p.m. in a quiet Jumeirah Beach Residence apartment when Fatima’s dishwasher suddenly groaned like an old ship setting sail. She froze mid-scroll on her phone, wondering, “Is this normal? Or is my appliance about to break down?”

If you’ve ever heard your dishwasher rattle, hum, buzz, or clunk in the middle of a wash cycle, you know how unsettling it can be. The good news? Not all noises mean disaster. But ignoring the signs could lead to bigger—and costlier—repairs.

Let’s break down the top reasons dishwashers make strange noises, and how to know when it’s time to call in professional help.

1. The Rattle of Loose Items

One of the most common causes of strange dishwasher noises isn’t mechanical at all—it’s user error.

When utensils slip out of the basket or lightweight plastic bowls flip over, they can rattle against the spray arm. Imagine a spoon clanging around like a drumstick inside your dishwasher—that’s enough to cause both noise and frustration.

For instance, a customer in Dubai once thought her dishwasher was breaking down because of loud clanging. On inspection, the technician found a butter knife lodged under the spray arm. Once removed, the dishwasher ran smoothly again.

Tip: Always load your dishwasher properly, securing utensils in their holders and heavier items at the bottom.

2. The Hum of a Hardworking Motor

Dishwashers use motors to pump water in and out, and it’s normal for them to hum. However, if the hum grows louder over time, it could indicate strain.

Furthermore, debris sometimes clogs the pump, forcing the motor to work harder. A faint hum is normal—like background music—but a deep growl isn’t.

Think of it like a car engine. A steady purr means everything is fine, but grinding noises are a red flag.

3. Buzzing from the Water Inlet Valve

Another common culprit is the water inlet valve—the part that controls how much water flows into the machine. When it malfunctions or gets clogged with minerals (especially common in hard-water regions like Dubai), it may buzz loudly during the filling cycle.

For example, Jamal noticed his dishwasher buzzing every time it started. The technician discovered calcium buildup in the valve. A quick cleaning fixed the issue and saved him from replacing an expensive part later.

4. Grinding from Debris in the Chopper Blade

Some dishwashers have a chopper blade that breaks down food particles before they drain. When something hard—like a popcorn kernel or a small piece of glass—gets stuck in the blade, it can create a grinding sound.

In contrast to rattling from loose items, this sound comes from deeper inside the machine. It often gets louder as the blade tries to grind through the debris.

Pro Tip: Always scrape plates before loading. Dishwashers are designed to handle small food residue, not full leftovers.

5. Thumping Spray Arms

Spray arms are the unsung heroes of clean dishes, spinning water with force. But if a dish is placed too close, the arm can hit it, creating a thumping or knocking sound.

For instance, Leila from JBR reported a “banging noise” during every cycle. When the technician checked, he found a large serving spoon blocking the spray arm’s path. Adjusting the dishes solved the problem instantly.

Lesson: A little extra care in loading can save you from unnecessary service calls.

6. Squealing from Worn Bearings

Over time, moving parts like bearings can wear out, leading to high-pitched squeals. This sound is harder to ignore—it’s like fingernails on a chalkboard.

As a result, squealing usually means it’s time for a repair. Ignoring it could cause more extensive damage to the motor or pump assembly.

7. Clicking During Normal Cycles

Not all noises are bad news. Clicking sounds often come from relays or timers as the dishwasher moves through different stages of its cycle.

Furthermore, some modern dishwashers make clicking noises when switching between spray arms or draining. If the noise is consistent and not overly loud, it’s usually nothing to worry about.

8. Gurgling While Draining

Ever notice a gurgling sound near the end of the cycle? That’s simply the dishwasher draining water. The sound may seem odd, but it’s often completely normal.

However, if the gurgling is accompanied by slow draining or standing water, it could indicate a partially clogged drain hose.

One customer thought her dishwasher was “dying” because of the gurgling noise. It turned out to be nothing more than a small clog in the drain line. A quick fix saved her both stress and money.

9. Banging Water Pipes

Sometimes, the noise isn’t coming from the dishwasher at all—it’s from the plumbing. When the water valve opens or closes suddenly, it can cause “water hammer,” a banging noise in the pipes.

In such cases, the dishwasher isn’t faulty. Installing a water hammer arrestor can fix the issue and keep your kitchen peaceful again.

When to Worry

While many dishwasher noises are harmless or easily fixed, some require immediate attention.

• Loud grinding or squealing → Possible motor or pump issue
• Persistent buzzing → Faulty inlet valve
• Sudden change in noise level → Sign of worn or broken parts

As a rule of thumb, if the sound is new, louder than usual, or accompanied by poor cleaning performance, it’s time to call a professional.

Preventive Habits to Keep Your Dishwasher Quiet

1. Load dishes properly, giving the spray arms room to spin.
2. Scrape plates to avoid hard debris clogging the chopper blade.
3. Schedule regular maintenance, especially in hard-water areas.
4. Listen to your dishwasher—strange noises are its way of asking for help.

Closing Reflection

A dishwasher is like a silent partner in your kitchen, quietly handling a job that used to take hours. But when it starts making strange noises, it’s sending you signals. Some sounds are normal, others are warnings, and knowing the difference can save you time, stress, and money.

Next time your dishwasher rattles, hums, or squeals, don’t panic. Instead, listen closely. Is it just a spoon out of place—or a sign of something more serious? Understanding the language of your dishwasher ensures it keeps serving you faithfully, one quiet cycle at a time.

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