--- title: "Dishwasher Making Loud Noise: Causes and Fixes" description: "Grinding, rattling, knocking or a loud hum that the machine did not make before." url: "https://dishwasherrepair.center/problems/dishwasher-loud-noise/" --- # Dishwasher Making Loud Noise Grinding, rattling, knocking or a loud hum that the machine did not make before. ## What it usually means. A dishwasher is never silent, and some sounds are normal: the whoosh of the fill, the swish of spray, the hum and gurgle of the drain. New noise usually means something is caught in a pump or a spray arm is hitting a dish. The time in the cycle it happens, and whether it sounds like grinding, rattling or humming, points to which part. The 5 causes, cheapest first Answer these first 01 Does the noise happen while filling, washing or draining? 02 Is it a grinding, a rattle, a knock, a squeal or a steady hum? 03 Did it start after a glass broke or a small item went missing from a load? 04 Does it happen with an empty tub too? 05 Is there a thumping in the pipes when the fill stops? ## Check these before you book. Dishwasher making loud noise: 5 checks, and none of them costs anything. 01 Spin both spray arms by hand with the racks loaded to see if anything stops them. 02 Remove the filter and look in the sump for glass, pits or small objects. 03 Note which part of the cycle the noise belongs to. ### Also worth checking - Run an empty cycle and listen; noise with no dishes is mechanical. - Check that the machine is secured to the cabinet and not rocking. ### How soon does it need a visit? Not urgent for most noises. A loud buzz with a burning smell, or a grinding that stops the pump, is different: turn off the breaker and do not run another cycle. ## The causes, cheapest first. 5 things dishwasher making loud noise turns out to be, from spray arm hitting a dish to worn wash motor bearings. [The cost guide](https://dishwasherrepair.center/cost/) 1. 01 no repair ### Spray arm hitting a dish A tall utensil or a pan handle stops an arm on each turn, which knocks in a regular rhythm. No repair: check it yourself 2. 02 low ### Debris in the drain pump Glass, pits and bits of bone rattle and grind in the pump during the drain. It is the most common source of a new noise. [Fixed by drain and pump repair](https://dishwasherrepair.center/services/drain-and-pump-repair/) 3. 03 low ### Water hammer at the inlet valve A fast-closing valve on a high-pressure line bangs the pipes. It is loud, but mostly a plumbing matter. [Fixed by fill and water valve repair](https://dishwasherrepair.center/services/fill-and-water-valve-repair/) 4. 04 low to moderate ### Chopper blade or impeller damage Many machines have a chopper at the pump inlet. A cracked blade or an impeller with a missing vane clatters and weakens the wash. [Fixed by wash motor and circulation](https://dishwasherrepair.center/services/wash-motor-and-circulation-repair/) [See dishwasher not cleaning dishes](https://dishwasherrepair.center/problems/dishwasher-not-cleaning/) 5. 05 moderate ### Worn wash motor bearings Failing bearings in the circulation motor give a growl or a squeal throughout the wash, louder over weeks. [Fixed by wash motor and circulation](https://dishwasherrepair.center/services/wash-motor-and-circulation-repair/) 6. What it costs ### Every repair on the site's cost scale, side by side Open the cost guide ## What else it could be. Most often confused with dishwasher not draining, then dishwasher not cleaning dishes. [All problems](https://dishwasherrepair.center/problems/) Codes that come with it - [`F45` ASKO · Wash motor and circulation](https://dishwasherrepair.center/error-codes/asko-f45/) - [`F56` ASKO · Wash motor and circulation](https://dishwasherrepair.center/error-codes/asko-f56/) - [`3C` Dacor · Wash motor and circulation](https://dishwasherrepair.center/error-codes/dacor-3c/) - [`A6` Fisher & Paykel · Wash motor and circulation](https://dishwasherrepair.center/error-codes/fisher-and-paykel-a6/) - [`F7E2` JennAir · Wash motor and circulation](https://dishwasherrepair.center/error-codes/jennair-f7e2/) - [`LE` LG · Wash motor and circulation](https://dishwasherrepair.center/error-codes/lg-le/) [7 more codes, by make](https://dishwasherrepair.center/error-codes/) ### Dishwasher Not Draining 6 causes ### Dishwasher Not Cleaning Dishes 5 causes Water or wiring at risk ### Dishwasher Burning Smell 5 causes ## The makes it happens on. 27 makes on this site; dishwasher making loud noise can show up on any of them. Each mark opens that make's own page. [All 27 brands](https://dishwasherrepair.center/brands/) ## Dishwasher Making Loud Noise, where we come out. 9 metros, each with its own page. 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What is happening? The drain pump is powered but cannot turn, usually because something is jammed in the impeller. Running it again and again can burn the motor out, so clear the filter and sump, then book a visit if it still hums. ### Is a new dishwasher supposed to be this loud? Quieter models are rated in decibels, and anything in the low forties is barely audible. A clicking every few seconds or a gurgle at the drain is normal on most machines. A steady grind is not. ### A glass broke inside. What should I do? Turn it off, remove the racks and pick out all visible pieces with gloves, then take out the filter and check the sump. Pieces left in the pump will grind and chip the impeller. ### The pipes bang when the dishwasher stops filling. Is that the dishwasher? That is water hammer, caused by the inlet valve closing fast on a high-pressure line. A water hammer arrestor on the supply line usually solves it without touching the dishwasher. --- **[Read on the site: Dishwasher Making Loud Noise: Causes and Fixes](https://dishwasherrepair.center/problems/dishwasher-loud-noise/)** **[Book a visit with DishwasherRepair.center](https://dishwasherrepair.center/schedule/)**