Dishwasher Making Loud Noise When Draining

Quick answer

A loud dishwasher during draining is often caused by a clogged drain pump filter or trapped debris. Turn off the power, check the filter, and clear any blockages. If the noise persists, inspect the drain pump for damage.

Confirm the symptom

• Loud noise occurs only during the draining cycle
• Noise sounds like grinding or rumbling
• Dishes are not draining properly

Tools and prep

• Screwdriver (flathead or Phillips, depending on model)
• Flashlight
• Plastic putty knife or small brush
• Bucket or towel
• Work gloves
• Turn off power at circuit breaker or unplug unit

Step-by-step troubleshooting

1. Check Drain Pump Filter
   Do: Locate the drain pump filter (usually at the bottom front or side of the dishwasher) and remove it with a screwdriver or by twisting.
   Observe: Filter is clogged with food particles, grease, or debris.
   Means: Clogged filter is restricting water flow and causing noise.
   Next: Clean the filter thoroughly with warm water and a brush.
2. Inspect for Debris
   Do: Use a flashlight to look inside the drain pump housing for any trapped objects like broken dishware or large food pieces.
   Observe: Foreign objects are lodged in the pump or drain hose.
   Means: Objects are causing the pump to work harder, creating noise.
   Next: Remove debris carefully with pliers or a putty knife.
3. Test Drain Pump Operation
   Do: Restart the dishwasher and listen to the pump during the drain cycle. Check for unusual vibrations or grinding sounds.
   Observe: Pump makes loud, continuous noise or vibrates excessively.
   Means: Pump motor or impeller may be damaged.
   Next: Turn off power and inspect the pump for wear or damage.
4. Check Drain Hose
   Do: Inspect the drain hose for kinks, clogs, or improper installation. Ensure it connects securely to the sink or garbage disposal.
   Observe: Hose is kinked or has a blockage.
   Means: Restricted water flow increases pump strain and noise.
   Next: Straighten the hose or clear the clog with a plumber's snake if needed.
5. Examine Pump Mounts
   Do: Look for loose or broken pump mounts or brackets that secure the drain pump in place.
   Observe: Mounts are loose or damaged.
   Means: Loose mounts allow the pump to vibrate and create noise.
   Next: Tighten or replace damaged mounts.
6. Test with Power Off
   Do: After cleaning and inspecting, run a short cycle without dishes to see if the noise returns.
   Observe: Noise is gone or significantly reduced.
   Means: Issue was likely due to a clog or minor debris.
   Next: Monitor performance over the next few cycles.

Common causes

Parts matching

Common parts needed to fix a loud dishwasher during draining:

• Drain Pump Filter (often clogged and needs cleaning or replacement)
• Drain Pump Housing (may need cleaning if debris is trapped)
• Drain Pump Assembly (replace if motor or impeller is damaged)
• Drain Hose (replace if kinked or clogged)
• Mounting Brackets (secure the pump to reduce vibrations)

Check your dishwasher model’s manual for specific part numbers and compatibility.

When to call a professional

• Noise persists after cleaning the filter and pump housing
• Drain pump shows visible damage or fails to operate
• You hear loud grinding or metal-on-metal sounds
• Dishwasher leaks water during draining
• You are unsure about accessing internal components safely
• Multiple parts need replacement beyond your comfort level

FAQ

Related guides

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