LG dishwasher loud noise | Fix Guide

Use only checks that match the exact appliance or system and its official guide.

1. Check 1

   Note the noise phase and pattern: while filling, during spray washing, while draining, during a selected express cycle, when the door is opened after a heated cycle, or continuously throughout operation.

   Expected result: The sound is a water whistle, brief drain buzz, filter-related growl or high-temperature alert, or it is a persistent rattle, squeal, grind or unfamiliar noise.

   Next step: If the sound follows a normal phase and stops as described, continue with loading and filter checks. If it is persistent, excessive or different from the unit's usual sound, pause the cycle and continue only with safe accessible checks.

   Why this matters

   Why: LG describes water-draw whistling, drain-pump buzzing that stops after draining, filter-cleaning growling and a high-temperature alert as expected possibilities; persistent or excessive sounds need a different path.

2. Check 2

   Pause the cycle and check that dishes, cutlery and light plastic items are secure and that no utensil protrudes into a spray arm's path.

   Expected result: A rack item or utensil can contact a spray nozzle or another dish, or the racks are correctly loaded and the noise remains.

   Next step: Reposition the items with the dishwasher paused according to the model loading guidance. If the rattle continues with an empty, correctly loaded rack, stop troubleshooting by load position and arrange inspection.

   Why this matters

   Why: LG says improper loading can cause rattling and protruding utensils can hit spray nozzles or dishes; an orderly load makes that explanation less likely but does not diagnose an internal part.

3. Check 3

   After stopping the cycle and following the model's safe access instructions, remove the accessible drain filter, inspect it for debris or looseness, clean it with warm running water and reinstall it securely.

   Expected result: The filter is clogged, loose or incorrectly seated, or it is clean and secure but the noise persists.

   Next step: Run only the model-approved next cycle if the filter was safely serviced and no leak or electrical concern exists. If rattling remains or access differs from the guide, stop and request service rather than reaching deeper into the sump.

   Why this matters

   Why: LG says a loose or clogged filter can rattle or shake; its maintenance guide says to remove debris and reinstall the filter in reverse order. A clean, correctly fitted filter does not rule in a pump failure.

4. Check 4

   With power and water isolated if the model manual requires it, inspect only the accessible spray-arm openings and visible tub area for food residue or an object that could contact the arm; do not remove the cabinet or pump cover.

   Expected result: A visible nozzle opening is blocked or an object is accessible without force, or nothing visible explains the sound.

   Next step: Clear only accessible residue using the model-appropriate maintenance method. If the spray arm still contacts something, grinding continues or the object is not safely accessible, keep the dishwasher off and arrange service.

   Why this matters

   Why: LG recommends clearing food residue from spray-nozzle heads and caring for the spray arms, but a visible obstruction is not evidence of a pump or motor defect.

5. Check 5

   Observe the sink and drain area during the affected phase from outside the cabinet, without using corrosive drain chemicals or disconnecting water lines.

   Expected result: The sink drains slowly, the noise is a loud gulping or air-sucking sound, water remains in the tub, or the external drain path appears normal.

   Next step: Stop if water backs up or leaks. Follow only model-specific external drain guidance or use qualified service; do not open the cabinet or infer an internal blockage from sound alone.

   Why this matters

   Why: LG links growling or gulping with detergent, food waste/residue and a clogged drain path; a slow sink can support an external drainage concern, but it does not identify the dishwasher pump.

6. Check 6

   Stop and arrange inspection when the noise is squealing or grinding, remains after loading and filter checks, is accompanied by leakage or an error, or is clearly excessive compared with prior cycles.

   Expected result: The abnormal noise persists, dishes or spray arms appear to catch, water leaks, a code appears, or the dishwasher operates normally after the accessible check.

   Next step: Turn the dishwasher off, protect the floor from any leak and request LG service with the exact model, cycle phase and recording. Do not run repeated cycles, remove the cabinet or replace a pump based only on the sound.

   Why this matters

   Why: LG says squealing/grinding can indicate a pump problem and that excessive or unfamiliar noise needs inspection; an error code or leak adds a model-specific service boundary.