Kenmore Dishwasher Making Noise — Sound Diagnosis by OEM Platform

Unusual noises from your Kenmore dishwasher are one of the most reliable diagnostic indicators available — each noise type maps to a specific mechanical failure. However, because Kenmore dishwashers use different motor designs, pump configurations, and spray arm assemblies depending on which manufacturer built them, the same noise can indicate different problems across platforms. A grinding noise on a Whirlpool-platform 665 model typically indicates a worn wash motor bearing, while the identical sound on an LG-platform 630 model usually points to debris in the drain pump impeller chamber.

Normal Operating Sounds (All Kenmore Platforms)

Before diagnosing a problem, understand what normal sounds like on your platform:

• Whooshing/swishing during wash — normal spray arm water distribution
• Brief humming at cycle start — inlet valve opening and water entering
• Clicking between phases — control board relays switching (more audible on Whirlpool 665 models which use mechanical relays vs. LG 630 models which use solid-state switching)
• Draining rush for 60-90 seconds between phases — drain pump evacuating water

Noise Diagnosis by Sound Type

Grinding/Growling Noise

Whirlpool 665 Platform: Grinding on Whirlpool-manufactured Kenmore dishwashers most commonly indicates worn bearings in the main circulation motor. The motor on 665 models uses sealed ball bearings that eventually wear after 8-12 years of service. As the bearings deteriorate, the motor shaft develops play, causing the impeller to contact the pump housing wall. This produces a grinding or growling sound that increases in volume over weeks.

A secondary cause on 665 models: the food chopper blade (present on models with a hard food disposer rather than a filter) can contact its housing when the mounting screw loosens.

LG 630 Platform: Grinding on LG-platform Kenmore dishwashers almost always indicates debris caught in the drain pump. The LG drain pump design uses a small impeller with tight clearances, and glass fragments, fruit pits, or bone chips can wedge between the impeller and housing. Unlike Whirlpool models where grinding is typically a gradual deterioration, LG platform grinding tends to start suddenly after a particular load.

DIY Difficulty: Easy for drain pump clearing; Moderate for motor bearing Parts Cost: $0 if debris removal only; $45–$90 for drain pump; $85–$200 for circulation motor Professional Repair Cost: $120–$350 depending on cause

Repair Steps (LG 630 — Drain Pump Debris):

1. Cancel the current cycle and disconnect power.
2. Remove the lower rack and filter basket from the tub floor.
3. Check the drain sump area (the recessed area under the filter) for visible debris.
4. If debris is not visible in the tub, access the drain pump from below by removing the kick panel.
5. Disconnect the drain pump (quarter-turn counterclockwise on LG platform) and inspect the impeller chamber.
6. Remove the obstruction, reassemble, and test.

Repair Steps (Whirlpool 665 — Motor Bearing):

1. Disconnect power and water. Pull the dishwasher from the cabinet.
2. Lay on its back and remove the base plate.
3. Spin the wash motor impeller by hand — roughness or grinding feeling confirms bearing wear.
4. Replace the circulation motor assembly (bearings are not separately serviceable on these motors).

Buzzing/Humming Noise

Whirlpool 665 Platform: A constant buzz or hum without the wash motor spinning indicates the motor is receiving power but cannot start. On 665 models, the most common cause is a seized impeller — a piece of broken dish, a utensil that fell through the rack, or food debris has physically locked the impeller. The motor windings energize and hum but cannot rotate. Left running in this state, the motor will overheat and potentially trip the thermal fuse.

LG 630 Platform: Buzzing on LG-platform Kenmore dishwashers can indicate a different issue entirely — the water inlet valve solenoid energizing but unable to open due to mineral deposits blocking the valve mechanism. The solenoid itself produces an audible buzz when powered. If you hear buzzing but no water enters the tub, the inlet valve is the likely culprit.

DIY Difficulty: Easy to moderate Parts Cost: $0 if impeller clearing; $30–$55 for inlet valve Professional Repair Cost: $100–$220

Repair Steps (Whirlpool 665 — Seized Impeller):

1. Disconnect power immediately to prevent motor damage.
2. Remove the lower spray arm and filter assembly.
3. Reach into the sump opening and try to rotate the impeller by hand.
4. If locked, look for the obstruction through the spray arm mounting hole or from below.
5. Remove the obstruction and verify the impeller spins freely before restoring power.

Banging/Thumping During Drain

All Platforms: A rhythmic thumping during the drain phase indicates the drain hose is moving — typically due to water hammer when the drain pump pulses. This is most common when the drain hose lacks a proper high loop or air gap installation. The water column in the hose surges back and forth, causing the hose to slap against the cabinet interior.

On Whirlpool-platform 665 models, the drain hose routes up the left side of the cabinet. On LG-platform 630 models, it routes up the right side. Verify your hose has a high loop secured at least 20 inches above the floor before it descends to the disposal connection.

DIY Difficulty: Easy Parts Cost: $3–$10 for hose clips Professional Repair Cost: $75–$130

Squealing/Screeching

Whirlpool 665 Platform: A high-pitched squeal specifically during the wash phase on 665 models indicates the wash motor bearing seal is failing. Unlike the grinding of a completely worn bearing, the squeal comes from the seal rubbing as the motor shaft rotates. This is an early warning — the bearing will progress to grinding within 2-4 months.

LG 630 Platform: Squealing on LG-platform models often comes from the spray arm bearings rather than the motor. The LG design uses a nylon bushing where the spray arm mounts to the water feed tower. When this bushing dries out (especially in homes with hard water that leaves mineral deposits), the spray arm squeals with each rotation.

DIY Difficulty: Easy for spray arm bushing; Moderate for motor Parts Cost: $5–$15 for spray arm parts; $85–$200 for motor Professional Repair Cost: $90–$350

Clicking/Ticking During Operation

Whirlpool 665 Platform: Rapid clicking during operation (not the normal relay click between phases) indicates the control board is repeatedly trying to activate a relay that will not hold. This often precedes complete component failure — the board may be trying to start the heater or motor thousands of times per cycle.

All Platforms: A slow tick-tick-tick coming from the base of the dishwasher during drain is often a small piece of debris being hit by the drain pump impeller with each rotation. Not immediately harmful, but the debris should be removed before it damages the impeller fins.

DIY Difficulty: Easy Parts Cost: $0 for debris removal Professional Repair Cost: $90–$150

When Noise Means Immediate Action Required

• Loud grinding that worsens over seconds: Motor seizure in progress — cancel cycle and disconnect power to prevent winding burnout.
• Electrical buzzing with burning smell: Active short circuit — disconnect power at the breaker immediately.
• Rhythmic banging increasing in intensity: Spray arm may have come loose and is striking the racks or tub walls — stop the cycle to prevent damage.

Noise Reduction Tips for Kenmore Dishwashers

Kenmore models, regardless of platform, tend to run quieter when properly maintained:

• Clean the filter/food trap weekly to prevent debris from reaching pump impellers
• Lubricate spray arm bearings annually with food-safe silicone (remove arm, apply drop to bushing, reinstall)
• Verify the dishwasher is level — an unlevel unit transfers motor vibration to the cabinet and floor
• Check that the mounting brackets at the top of the dishwasher are tight against the countertop

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Unusual noise from your Kenmore dishwasher? Our technicians can identify noise sources on the first visit and carry replacement motors and pumps for both Whirlpool and LG platform Kenmore units. Schedule a repair →