The short answer
On a Cove dishwasher that has been in service for years, a new noise on a machine designed to be silent is a clear signal: an arm bearing that has developed play, a pump that has aged, or mounting hardware that has loosened. Run an empty cycle first, and take a persistent noise seriously rather than living with it.
What you are actually seeing
- The noise is the same on an empty cycle as on a loaded one — Means: on-page
- The machine has become steadily louder over a year or more — Means: on-page
- A spray arm wobbles when spun by hand — Means: on-page
- A drone during the wash that was not there before — Means: on-page
- Rattling from behind the custom panel rather than inside the tub — Means: on-page
- A bang in the pipes when the machine fills — Means: different-fault — Go to: cove-dishwasher-water-leak
- A buzzing with no cycle running — Means: different-fault — Go to: cove-dishwasher-electrical-safety
- Body: Match what you see before you take anything apart. The noise is the same on an empty cycle as on a loaded one. The machine has become steadily louder over a year or more. A spray arm wobbles when spun by hand. A drone during the wash that was not there before. Rattling from behind the custom panel rather than inside the tub. Some near-miss symptoms belong on a different page: A bang in the pipes when the machine fills points at water hammer in the house plumbing rather than the appliance, covered on cove-dishwasher-water-leak; A buzzing with no cycle running points at an electrical fault, covered on cove-dishwasher-electrical-safety.
Causes, ranked for this machine
- A spray arm bearing that has worn and developed play — Why this rank: First on an older machine because it is a plain bearing running in hot detergent water for thousands of cycles
- A wash pump that has become audible with age — Why this rank: On a machine designed to be silent, a pump that has aged is noticeable long before it fails
- Mounting brackets and fixings loosened by years of vibration — Why this rank: A rattle from behind the panel rather than inside the tub points here
- An object that has been in the sump long enough to damage the impeller — Why this rank: Long-standing debris does more than make a noise, and the damage outlasts its removal
- Installation contact that has developed as the cabinetry has moved — Why this rank: Fitted kitchens shift over years, and a hose that never touched a cabinet wall may do so now
- Body: Ranked for a premium built-in dishwasher: hard-plumbed, on a dedicated supply, installed under a worktop by a fitter, quiet by design, with hand-cleaned filtration and a condensation dry that depends on rinse aid. Most likely: A spray arm bearing that has worn and developed play. First on an older machine because it is a plain bearing running in hot detergent water for thousands of cycles. Next most likely: A wash pump that has become audible with age. On a machine designed to be silent, a pump that has aged is noticeable long before it fails. Third: Mounting brackets and fixings loosened by years of vibration. A rattle from behind the panel rather than inside the tub points here. Fourth: An object that has been in the sump long enough to damage the impeller. Long-standing debris does more than make a noise, and the damage outlasts its removal. Fifth: Installation contact that has developed as the cabinetry has moved. Fitted kitchens shift over years, and a hose that never touched a cabinet wall may do so now.
What to check, in order
- Run an empty cycle to separate the load from the machine
- Spin each arm by hand and feel for play at its bearing
- Check the visible mounting brackets and fixings for looseness
- Open the adjacent cabinet and look for new contact points
- Body: Each check rules out the causes above it. First, run an empty cycle to separate the load from the machine. Second, spin each arm by hand and feel for play at its bearing. Third, check the visible mounting brackets and fixings for looseness. Fourth, open the adjacent cabinet and look for new contact points.
Checks you can safely make yourself
- Run a short cycle with the machine completely empty and note whether the noise is unchanged — Tools: none — Time estimate: one short cycle
- Spin each spray arm on its mount and feel for side play, roughness or wobble — Tools: none — Time estimate: a few minutes
- Switch off at the breaker and check the visible mounting brackets and fixings, tightening by hand only — Tools: screwdriver — Time estimate: a quarter of an hour
- Remove the filtration and inspect the sump and the visible impeller for debris or damage — Tools: torch, gloves — Time estimate: a quarter of an hour
- Open the adjacent cabinet and look for a hose or a cable that now rests against a cabinet wall — Tools: torch — Time estimate: a quarter of an hour
- Body: Checks an owner can make with the machine switched off at the breaker, or by watching a cycle. Step one: Run a short cycle with the machine completely empty and note whether the noise is unchanged. Tools: none. Time: one short cycle. Step two: Spin each spray arm on its mount and feel for side play, roughness or wobble. Tools: none. Time: a few minutes. Step three: Switch off at the breaker and check the visible mounting brackets and fixings, tightening by hand only. Tools: screwdriver. Time: a quarter of an hour. Step four: Remove the filtration and inspect the sump and the visible impeller for debris or damage. Tools: torch, gloves. Time: a quarter of an hour. Step five: Open the adjacent cabinet and look for a hose or a cable that now rests against a cabinet wall. Tools: torch. Time: a quarter of an hour.
Safety first
Safety
Switch off at the breaker and at the isolating switch before reaching into the sump, and wear gloves: a hard object under fine filtration is usually broken glass. Do not run the machine with a known object in the sump, and do not pull an integrated machine out of its opening to chase a noise: the custom panel and the worktop make that a service job. On a machine of this age, remember that the door carries a custom panel under spring tension set years ago: do not loosen door hardware, and treat any water reaching fitted cabinetry as urgent rather than cosmetic. Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. unplug-before-service
Where the owner fix ends
On an older machine, call a technician once an empty cycle reproduces the noise, the sump is clear and the mountings are tight. A worn arm bearing or an ageing pump on a machine of this quality is a defined repair and normally worth making rather than replacing an integrated appliance.
Nearest pages of the same kind
Generalized information
This page is generalized across the Cove dishwasher line. Fully integrated machines carrying a custom cabinet panel and machines with a finished front share the ranking above but not every part, and this page does not cover a specific model, control revision or installation. Family- and model-specific pages, where they exist, are linked below.
Links: - [Common COVE Dishwasher Problems](/blog/cove-dishwasher-problems) - [Cove Dishwasher: Does Not Clean or Dry](/blog/cove-dishwasher-cleaning-performance-2) - [Cove Dishwasher: Controls, Display or Error Code](/blog/cove-dishwasher-control-fault-2) - [Cove Dishwasher: Cycle Will Not Run or Complete](/blog/cove-dishwasher-cycle-fault-2)
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
