If your LG dishwasher makes a high pitch squeal noise during the cycle, it can be extremely annoying. You may have already tried cleaning it with vinegar or running empty cycles, but the sound still persists.
This issue often shows up suddenly, even in relatively new machines, and figuring out the cause can be frustrating.
Quick Answer
A high pitch squeal noise in an LG dishwasher is most commonly caused by a worn circulation pump motor bearing.
In most cases, the fix is to replace the circulation pump assembly.
Step-by-step solution to fix high pitch squeal noise
Step 1: Identify when the noise occurs
Pay attention to the timing:
- During wash cycle → likely circulation pump issue
- During draining → could be drain pump
Most squealing noises happen during water circulation.
Step 2: Confirm it’s not debris
Even if you cleaned it, double-check:
- Remove filters
- Inspect pump area
- Look for:
- Food particles
- Small objects
Debris can sometimes cause unusual sounds, though usually not a sharp squeal.
Step 3: Understand the main cause - pump bearings
The most common issue is:
- Worn motor bearings inside the circulation pump
Symptoms:
- High-pitched whining or ringing sound
- Gets louder over time
- Happens consistently during cycles
Unfortunately, bearings are not repairable separately.
Step 4: Replace the circulation pump
If bearings are worn:
- Replace the entire circulation pump assembly
- This is the permanent fix
Temporary fixes won’t eliminate the noise.
Step 5: Rule out detergent buildup
In some cases:
- Soap residue or limescale builds up
- Affects water flow and noise
Try:
- Switching detergent type
- Using dishwasher cleaner or pods with degreasing agents
Some users report reduced noise after changing detergent.
Step 6: Check for pump impeller issues
Even if the motor runs:
- The impeller may be loose or worn
- This reduces pressure and creates noise
A slipping impeller can mimic bearing failure.
Step 7: Don’t rely on “break-in” explanations
You might hear:
- “The dishwasher needs time to break in”
In reality:
- Persistent squealing is not normal
- If noise continues after multiple cycles, it’s a fault
Step 8: Consider professional inspection
If unsure:
- Call a technician
- Request pump inspection or replacement
Some users reported full resolution only after motor replacement.
Extra tips and best practices
- Run regular cleaning cycles to prevent buildup
- Use high-quality detergent
- Avoid overloading dishes
- Inspect filters weekly
- Address unusual sounds early
Common mistakes to avoid
- Ignoring the noise until it worsens
- Believing it will “fix itself” over time
- Repeatedly cleaning instead of diagnosing
- Replacing the wrong component
- Accepting excessive noise as normal
FAQ
Why does my LG dishwasher make a high-pitched noise?
It’s usually due to worn circulation pump bearings or internal pump damage.
Can vinegar fix the squealing noise?
No. Vinegar helps with cleaning but won’t fix mechanical wear.
Is it safe to keep using the dishwasher?
Yes, temporarily. But the noise may worsen and lead to pump failure.
Conclusion
If your LG dishwasher has a high pitch squeal noise, the most likely cause is a failing circulation pump motor. Cleaning and detergent changes may help slightly, but they won’t fix worn bearings.
For a long-term solution, replacing the pump is usually the best option.
Reference Links
https://www.lg.com/support
https://www.ifixit.com/Device/Dishwasher
https://owner.electrolux.com/support-articles/article/1819543-dishwasher-not-drying
