LG dishwasher makes grinding, humming, knocking or squealing noises: most noise from the LG LDP6810 is normal, and LG's FAQ names the two you will hear most: a whistling sound when water is drawn in, which is normal and gets louder if the water pressure is too high, and a continuous chime if you open the door during or right after a cycle, which just warns that the inside is hot. If the whistle is loud, LG says it may be necessary to adjust the water valve to lower the pressure. Rattling or scraping is usually a loose rack, a utensil in the spray arm or an unlevel dishwasher.
Differential
Likely causes of “LG dishwasher makes grinding, humming, knocking or squealing noises”, and how to tell them apart
- 1
High water pressure causing a whistle while filling
What separates it A whistling that starts when water is drawn in and stops when filling ends
How to confirm Note when in the cycle it happens; LG says to lower the pressure with the water valve if it is loud
- 2
A spray arm hitting a dish or utensil
What separates it A clicking or scraping that repeats as the arm turns
How to confirm Turn the arms by hand; LG says dishes must not block spray arm rotation
- 3
The dishwasher is not level or not secured
What separates it Rattling or thumping that changes when you push the door or tub
How to confirm Check level and adjust the feet until all touch the floor
- 4
The door chime warning of hot contents
What separates it A continuous beeping after you open the door during or just after a cycle
How to confirm Wait for the interior to cool; LG says the chiming stops once it has
Before you touch a setting
Record this first — changing settings destroys the evidence
- What the noise sounds like: whistle, rattle, scrape, hum or chime
- When in the cycle it happens: filling, washing, draining or drying
- Whether the noise stops when you open the door or when you turn the water valve down
Try in this order
0 of 5 completedNote when the noise happens
ReversibleLG says it is important to determine the duration of the noise and when in the cycle it happens. A whistle while filling is different from a scrape while washing.
Check the spray arms and racks
ReversibleTurn the arms by hand and check nothing hits them. Push the racks in fully and seat the utensil basket so nothing rattles.
Check the level
ReversiblePut a level in the tub side to side and pour water for the front-to-back check as the manual describes, then adjust the front and rear feet until they all press firmly on the floor.
Check the water pressure
ReversibleThe dishwasher needs 20 to 80 psi. If the pressure is high and the fill whistle is loud, LG says the water valve may need adjusting to lower it.
Open the door only after the cycle
ReversibleLet the cycle finish and cool. LG says the chime after opening the door is a hot-interior warning, not a fault.
Model-specific
What is true of this model and not of its siblings
- Normal sounds from the manual
- Whistle while filling (louder with high pressure), a continuous chime when the door is opened hot, and the warranty's exclusion of noises associated with normal operation.
- Parts for this problem on the LDP6810 (RepairClinic, 2026-09-21)
- circulation pump and motor assembly with heater, part number AGM30016301, at $95.94; diverter motor for upper and lower spray arms, part number 4681ED3001D, at $53.20; case assembly, part number ABQ75742505, at $101.53.
- Other models this page answers
- These steps also fit models LDP7808, LDPH7972, LDFN4542, LDFN3432, LDF5545, Signature Kitchen Suite SKSDW2401 dishwasher.
Stop boundary
When this stops being a self-service repair
- !If a grinding, screeching or loud humming continues with an empty tub and free spray arms, call LG customer service
- !If LE or NE (wash motor or vario motor) shows with a noise, call LG
- !If the water valve is what makes the noise, have a plumber check the water pressure
Evidence ledger
Sources behind this answer
LG USA support page listing this model's manuals and warranty.
Parts and list prices as shown on RepairClinic's parts search for this model number on 2026-09-21.
Exact questions
Common questions
Why does my LG dishwasher whistle?+
LG says a whistling noise when water is drawn in is normal. If the water pressure is too high it is louder, and it may be necessary to adjust the water valve.
Why does it chime when I open the door?+
LG says this is normal; the dishwasher is warning that the interior is hot and to use caution when reaching inside. It stops once the unit has cooled.
Can I turn the chime off?+
You can turn off the button sounds by pressing and holding Dual Zone and Energy Saver for three seconds, but LG says the error alert sound cannot be turned off.
Is normal operating noise covered by the warranty?+
No. LG's limited warranty excludes any noises associated with normal operation.
What if a dish is hitting the spray arm?+
Make sure dishes do not block spray arm rotation, and check that the arms rotate freely after cleaning and reassembly.
Does leveling change the noise?+
It can. Adjust the front and rear feet until they all press firmly on the floor, then recheck with a level in the tub.
How do I check side-to-side level?+
Remove the lower rack and place a level on the tub inside wall. A smartphone level app can be used if you do not have a level.
Does LG list a noise that means a fault?+
The manual lists LE (wash motor error) and NE (vario motor error) as faults for which to call LG, and none of the normal sounds above.