Asko Dishwasher: Abnormal Noise or Vibration
Most dishwasher noise is something being struck rather than something failing: a spray arm hitting a pan handle, a fallen item lying on the sump, or an object drawn into the pump. Asko is a Scandinavian premium brand: heavier build, stainless interiors, machines designed for long life and quiet running. Checking the load, the arms and the sump is owner work and it explains most of these. Pump and bearing noise is not.
What the owner actually observes
- A rhythmic knocking or ticking that keeps time with the spray arm turning.
- A grinding or rattling that happens only at the drain step.
- A loud humming that has always been there but has become louder.
- A scraping when the lower arm passes a particular point.
- The machine is much louder in one kitchen position than it used to be elsewhere.
- Not this fault: If the noise arrives with water left in the sump, the pump is working against a blockage. That is a different fault — see Asko Dishwasher: Will Not Drain (asko-dishwasher-drainage-failure).
- Not this fault: If dishes are also poorly washed, an arm that cannot turn freely explains both. That is a different fault — see Asko Dishwasher: Does Not Clean or Dry (asko-dishwasher-cleaning-performance).
Ranked for an Asko dishwasher
- Deferred maintenance and water quality — scale, residue and clogged screens — Rank: first — Why ranked here: it ranks where it does because a machine built to last outlives its consumables by a wide margin, so on any Asko with years of service the accumulated residue is a more likely cause than the components themselves
- Loading — an item in the path of a spray arm — Rank: second — Why ranked here: it ranks where it does because it produces the most common noise complaint by a wide margin, because a pan handle or a utensil hanging through the basket stops or strikes an arm on every rotation, and because it costs nothing to correct
- An object in the sump or drawn into the pump — Rank: third — Why ranked here: olive stones, glass fragments and jar labels get past a filter that is not seated and reach the pump, where they rattle at every rotation and are heard most clearly at the drain step
- The machine not level, or in hard contact with the cabinetry — Rank: fourth — Why ranked here: a built-in dishwasher transmits its running noise into the carcass around it, so a machine that has settled or is packed tight against a cabinet side sounds far louder than the same machine standing free
- Normal sounds heard for the first time — Rank: fifth — Why ranked here: valves clicking as they open, the drain pump starting, and the arms changing pressure are all normal, and a quieter kitchen or a new machine makes them audible
- A spray arm bearing worn or an arm not seated — Rank: sixth — Why ranked here: an arm that is not clipped fully home wobbles as it turns and knocks against the rack above or the tub below
- Note: Because these machines are built heavier and quieter than average, the order below puts consumables, water quality and maintenance first, and structural or mechanical failure last: on a machine built this way, the odds move away from the metal and toward what passes through it.
Check in this order
- That both spray arms turn freely by hand with the racks loaded, before the door is closed — Order: first — Because: it is free, instant, and it explains a noise that comes and goes with different loads
- The filter assembly and the sump beneath it, wearing gloves — Order: second — Because: it is free, it is where hard objects collect, and finding one ends the job
- That the machine is level and that its sides are not pressed hard against the cabinetry — Order: third — Because: it is free and it explains a machine that has become louder without anything changing inside it
Owner-safe checks
- Look at what the machine has been consuming rather than what it is made of. Check filters, seals and screens for the residue of hard water and detergent, and check that the maintenance the machine expects has actually been done — on a heavily built machine, that is where the fault usually is. — Step: first — Tools: a torch and a phone camera — Time estimate: a few minutes
- Load the machine, then before closing the door spin each spray arm by hand through a full rotation. Anything it strikes is the noise, and rearranging the load costs nothing. — Step: second — Tools: nothing — Time estimate: a few minutes
- Remove the filter assembly and check the sump beneath it for hard objects — glass, stones, labels — wearing gloves. Refit the filter so it locks positively home. — Step: third — Tools: gloves, a torch — Time estimate: under a quarter of an hour
- Listen through a cycle and note whether the noise is continuous, rhythmic with the arm, or confined to the drain step. Those three point at three different parts. — Step: fourth — Tools: nothing — Time estimate: one cycle
- Check the machine is level and that its sides are not pressed hard against the cabinetry, and confirm the plinth and any decorative panel are secure rather than resonating. — Step: fifth — Tools: a spirit level, a screwdriver — Time estimate: under a quarter of an hour
- Clear every filter and screen the machine has, and check whether the water it runs in is hard: scale and detergent residue collect on the surfaces that matter most and produce symptoms that mimic component failure. Then run one cycle and reassess before opening anything. — Step: sixth — Tools: a soft brush, white vinegar or a descaler, a torch — Time estimate: under a quarter of an hour, plus a cycle
- Stop condition: Stop before removing the sump housing or the pump; those need the machine pulled out from under the worktop.
Safety
Safety
Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. Dishwasher sumps contain broken glass, and the machine is connected to water and electricity beneath a worktop. Wear gloves when reaching into a sump, since glass fragments collect around the filter. Wear gloves when reaching into a sump, since glass fragments collect around the filter. unplug-before-service
When to call a technician
The line is any noise from the pump or the sump housing. Call if a grinding noise persists at the drain step after the sump and filter have been cleared. Call if a continuous hum has become much louder, which points at a pump bearing. Call if a spray arm does not turn freely even when nothing obstructs it. Call if the noise arrived alongside water left in the machine.
Nearest pages of the same kind
What this page does not cover
This page is generalized across every family and model sold under the Asko badge. It does not carry model-specific error-code tables, family-specific service procedures, sealed-system work or parts numbers, and no model-specific page exists beneath it yet — the data plate on your unit is the authority, not this page. For the other faults on this appliance, start from Common Asko Dishwasher Problems (asko-dishwasher-problems) and pick the symptom that matches.
Links: - [Common Asko Dishwasher Problems](/blog/asko-dishwasher-problems) - [Asko Dishwasher: Does Not Clean or Dry](/blog/asko-dishwasher-cleaning-performance) - [Asko Dishwasher: Controls, Display or Error Code](/blog/asko-dishwasher-control-fault) - [Asko Dishwasher: Cycle Will Not Run or Complete](/blog/asko-dishwasher-cycle-fault) - [Asko Dishwasher: Door, Latch or Seal Fault](/blog/asko-dishwasher-door-seal)
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
