Asko Dishwasher Loud Noise: Grinding, Humming, Rattling

Most owners of a quiet 24-inch dishwasher know its normal sounds well: the fill, a soft spray, a gentle change as the pump drains. When a harsh new noise appears, the mind goes straight to the worst, but sounds are diagnostic. The kind of noise, when it occurs in the cycle and whether it changes with the load narrows the cause considerably.

Match the sound to the stage

Pay attention to when the noise starts. Noise during the first minutes, while water enters, can come from the supply line shaking in a tight cabinet. Noise while the sprayers run points to the spray arms, the circulation pump or something in the tub. Noise at the end, when the machine empties, points to the drain pump or to hard items caught in the sump. A noise that begins only at the heated drying stage can be an expanding panel or a part that moves as it warms.

Common sounds and what they suggest

• Rattling or clanking. Usually a loose item: a utensil that has slipped through the basket, a lid or a small cup that has fallen, or a spray arm striking a tall item. The cheapest explanation is also the most common.
• Grinding or crunching. Glass chips, bone fragments, fruit stones or label bits caught near the drain pump or filter. It can also mean a pump bearing is worn.
• Humming or buzzing without water movement. A pump trying to turn but blocked, or one that has failed. If the machine hums and nothing drains, treat it as a pump problem.
• High-pitched squeal. A dry bearing or a worn seal in a pump; sometimes a spray arm that is catching a rim.
• Knocking in the walls. Water hammer from the house plumbing when the inlet valve shuts. The dishwasher is only the trigger.
• Clicking. Normal relay sounds, or a diverter that is trying to move and cannot.

Safe checks before you call

1. Switch the dishwasher off at the breaker and pull out the lower rack. Look for anything on the tub floor.
2. Take out the filter parts that lift out, and rinse them. Hard debris in the filter or sump is the most common source of grinding.
3. Spin each spray arm by hand and make sure it moves freely without touching a tall pot or the rack.
4. Check that all racks sit properly on their rails and the cutlery basket is clipped in.
5. Run one rinse with a light load and listen again. If the noise is gone, a loose item was the cause.

Codes that arrive with noise

If the noise comes with an F-number, our reference gives a head start. F56 is a circulation pump fault, which fits a pump that is humming, laboring or silent. F68 is a BLDC drain pump fault for the DBI564 series, and F45 is a diverter fault, which can show as clicking while the machine decides where to send water. Our guide to Asko dishwasher error codes lists the others.

Installation causes of noise

Dishwashers in older Bay Area flats are often fitted into cabinets that flex, on floors that are not quite level, with hoses that touch the sides of the cutout. A hose pressed against a cabinet wall transmits vibration like a drum. A machine that rocks slightly on its feet makes a thump as the pumps start. A supply line with no slack on a rigid pipe sends a hum through the sink base. Fixing those is an installation adjustment: levelling the unit, padding or rerouting the hose, and securing the machine to the cabinet. It is a normal part of a diagnosis visit and often solves the complaint without any part.

What to avoid

• Do not reach into the sump area with metal tools while the machine is plugged in.
• Do not keep running a machine that grinds loudly. A foreign object can score the pump housing.
• Do not ignore a burning smell that comes with a hum; switch off at the breaker.
• Do not open the lower panel or remove the pump.

When to book

Book when the noise remains after the filter and spray arms are clear, when a pump code appears, when the machine hums but does not wash or drain, or when a squeal grows louder cycle by cycle. A pump that runs rough often has little life left, and replacing it early limits the chance of a flood or a half-washed load. We diagnose before repairing, give a written estimate and wait for approval. The technician will read the model number from the door edge or tub rim, since the pumps vary by family; the 50 Series DBI565 and the 60 Series DBI776 are two of the families in our library. See Asko dishwasher repair and the Asko dishwashers guide for more.

Describing the noise accurately

When you call, a short description is worth more than the word “loud”. Say whether the noise is rhythmic, tracking the spray arm turn, or constant; whether it happens in every program or only the heavy one; and whether it began suddenly or crept up over weeks. Sudden noise usually means something has moved or broken, while a slow increase suggests wear in a bearing. If you can, record a short audio clip on your phone near the door edge. A clip is easy to share and lets the technician recognize a failing pump before arriving, which can mean the right part is on the van.

Frequently asked questions