Dishwashers are designed to operate quietly. If you suddenly hear a loud grinding noise during the wash or drain cycle, it’s a sign that something isn’t functioning properly. Ignoring unusual noises can lead to more serious damage and costly repairs.
At Appliance Forever, we specialize in professional dishwasher repair across the Greater Toronto Area. Here’s what a grinding noise could mean and what you should do next.
Normal Dishwasher Sounds vs. Problem Noises
During a standard wash cycle, it’s normal to hear:
- A low humming or whirring from the motor and pump
- Water spraying against dishes
- Light clicking from the detergent dispenser
However, a loud grinding, rattling, or scraping sound is not normal and usually indicates a mechanical or obstruction issue.
Common Causes of Dishwasher Grinding Noise
1. Foreign Objects in the Pump or Drain Area
Small items such as broken glass, bones, fruit pits, or even pieces of utensils can become lodged in the drain pump or impeller.
What to do:
- Remove the lower rack
- Inspect and clean the filter
- Check the drain area for debris
- Carefully remove any foreign objects
If the grinding stops after cleaning, the issue was likely debris-related.
2. Worn or Damaged Drain Pump
The drain pump removes water at the end of the cycle. If the pump impeller or motor bearings are worn, they can produce a grinding or growling sound.
This repair typically requires professional disassembly and pump replacement.
3. Blocked or Damaged Spray Arms
If spray arms are clogged, cracked, or obstructed by improperly loaded dishes, they may hit objects during rotation, causing noise.
Solution:
- Remove and clean spray arms
- Clear blocked holes
- Replace cracked components
- Load dishes properly
4. Improper Loading
Loose utensils, lightweight plastic containers, or broken dishes can shift during operation and create grinding or rattling sounds.
Always ensure items are secured and not interfering with spray arm movement.
5. Faulty Circulation Motor
The circulation motor pushes water through the spray arms. If the bearings are failing, you may hear grinding during the wash cycle.
Motor failure requires professional diagnosis and replacement.
6. Inlet Valve or Hard Water Buildup
Mineral deposits can restrict water flow and cause vibration noises during filling. Hard water can also lead to internal component wear.
Regular descaling helps prevent buildup-related damage.
Preventive Maintenance to Avoid Grinding Noises
- Clean the dishwasher filter monthly
- Inspect spray arms for blockages
- Avoid overcrowding racks
- Use high-quality detergent
- Run hot water in the sink before starting a cycle
- Descale periodically if you have hard water
Routine maintenance significantly reduces repair risks and extends appliance lifespan.
When to Call a Professional Dishwasher Repair Technician
Contact a professional if:
- The noise persists after cleaning
- Water is not draining properly
- The dishwasher leaks
- Error codes appear
- The motor or pump seems to be the source
Running a dishwasher with internal mechanical damage can worsen the issue and increase repair costs.
Frequently Asked Questions
Is it safe to run my dishwasher if it’s making a grinding noise?
No. Continuing operation may cause further damage to the pump or motor assembly.
How do I know if it’s the pump or just debris?
If cleaning the filter and drain area doesn’t resolve the issue, the pump or motor may be faulty.
Can I repair the pump myself?
Pump replacement requires disassembly and electrical handling. Professional service is recommended for safety.
What causes dishwasher pump failure?
Debris buildup, worn bearings, hard water deposits, and prolonged use can all contribute to pump damage.
Professional Dishwasher Repair in the GTA
If your dishwasher is making a grinding noise, don’t ignore it. Appliance Forever provides fast, reliable dishwasher repair services throughout Barrie, Newmarket, Aurora, Richmond Hill, Vaughan, Markham, Scarborough, North York, and Thornhill.
We service all major brands including Samsung, LG, Whirlpool, Bosch, GE, Maytag, and more.
Schedule your dishwasher repair today and restore quiet, efficient performance to your kitchen.
