Why Your Dishwasher Is Making Noise — And What to Do About It
A quiet hum is normal for a dishwasher, but grinding, buzzing, or thumping sounds usually mean something needs attention. Different noises point to different problems, and understanding them helps you decide whether to keep running the machine or call for a repair.
Grinding or Crunching Sounds
A grinding noise often means a foreign object, such as a piece of glass or a fruit pit, has made its way into the pump or chopper assembly. It can also indicate a worn pump bearing. Running the machine with debris in the pump can cause further damage, so it is best to investigate quickly.
Buzzing or Humming
A persistent buzz can come from the drain pump struggling against a blockage or from the wash motor wearing out. A faint hum during operation is normal, but a loud or unusual buzzing sound warrants a closer look.
Thumping or Knocking
Thumping is sometimes caused by the spray arm hitting a tall item like a pot handle, which is harmless once you rearrange the load. If the knocking continues with an empty machine, the water inlet valve or internal hoses may be the cause.
Squealing or High-Pitched Noise
A squeal usually points to a worn motor seal or bearing, or a problem with the wash pump. These components benefit from prompt attention before the noise turns into a complete failure.
Frequently Asked Questions
Is it safe to run a noisy dishwasher?
If the noise is from items touching the spray arm, rearranging the load fixes it. For grinding or squealing, stop the machine and have it inspected to prevent further damage.
Why is my dishwasher louder than it used to be?
Increasing noise over time often signals a wearing pump or motor bearing. A technician can confirm and replace the affected part.
Do you repair built-in and portable dishwashers?
Yes. We service all dishwasher types and most major brands across our Ontario service area.
Need This Repaired?
Our local technicians serve 30+ Ontario cities with same-day service and a 90-day parts and labour warranty.
