Dishwasher Making Grinding Noise – Causes, Fixes & Prevention

A dishwasher making a grinding noise can sound alarming, but in most cases, the fix is simple. Grinding usually means something is stuck, loose, or worn out inside the dishwasher.

This article uses a diagnostic checklist format so you can quickly identify the problem and fix it without guesswork.

✅ Step-by-Step Fixes (Start From the Easiest)

1. Remove Debris From the Filter Assembly

Food particles are the most common reason for grinding noises.

What to do:

1. Remove the bottom rack

2. Twist and lift out the filter

3. Rinse under warm water

4. Remove glass shards, seeds, or bones

✔ Fixes noise in most cases within minutes.

2. Inspect the Spray Arms

Spray arms rotate at high speed. Any obstruction can cause grinding.

Check for:

• Toothpicks or labels stuck in holes

• Cracks in the arm

• Arm hitting dishes while spinning

Fix:

• Clean holes with a toothpick

• Replace cracked spray arms

• Reload dishes properly

3. Check the Drain Pump for Blockage

Grinding during draining usually points to the drain pump.

How to check:

• Disconnect power

• Access pump from bottom panel

• Remove debris like glass or plastic

⚠ If the impeller is damaged, replace the pump.

4. Inspect the Chopper Blade (If Equipped)

Some dishwashers use a chopper to break down food.

Symptoms:

• Loud grinding early in cycle

• Dishwasher still cleans poorly

Fix:

• Replace the chopper blade if dull or broken

A damaged chopper sounds exactly like grinding metal.

5. Make Sure Nothing Is Loose Inside

Sometimes the noise isn’t mechanical.

Check for:

• Utensils falling through rack

• Loose screws or rack clips

• Broken rack wheels

Secure or replace loose parts to eliminate rattling and grinding.

6. Check the Motor Bearings (Advanced)

If grinding continues even when empty:

Signs of motor failure:

• Constant loud grinding

• Burning smell

• Poor water circulation

Solution:

• Motor replacement or dishwasher replacement

At this stage, repair may not be cost-effective.

❌ What NOT to Ignore

• Grinding that gets louder over time

• Water not draining properly

• Dishes coming out dirty

These signs mean internal damage may be spreading.

🛡️ How to Prevent Grinding Noises in the Future

• Rinse large food particles before loading

• Clean the filter weekly

• Don’t overload racks

• Run a monthly cleaning cycle

Preventive care keeps pumps and motors quiet.

🧠 Final Verdict

A dishwasher making a grinding noise is usually caused by debris in the filter, spray arm, or drain pump. Start with cleaning and inspection before replacing parts. Most fixes take less than 30 minutes and cost nothing.

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