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LG LDF7551ST dishwasher making load noises

7551ST

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6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
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Posted on Jan 02, 2017

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SOURCE: LG Dishwasher LDF7811 Making Growling Noise

Recommendations:
-Switch to a brand name detergent powder - like Electrosol or Cascade and do not fill the dispenser cup full. You will notice the difference immediately.
-Remove the filter assembly one more time and inspect underneath with a flashlight. Look closely for debris and also inspect the impeller to look for damage and that it is spinning freely.
Reassemble and listen for the growling sound. It should not happen. If it continues, you may have a a failing wash motor / motor bearing.
Please report back what you find. OK?

Posted on Apr 11, 2009

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SOURCE: Our LG LDF7920st dishwasher (6 months old)makes a whistling noise

Hey, consider the float assembly!

We bought this dishwasher and ran it for the last 1 1/2 months and it made a grinding and whistling sound from day one (it's supposed to be nearly silent in its operation). Turns out the drain pump was cutting in while the machine was still filling, thereby emptying the wash tub of any water. Then, when the cycle proceeded to wash, the dumb thing had no water and made a horrible noise. So I had to pitch in at least 2-3 litres of hot water, and then it worked quietly! Had to do this every time there was new water intake.

After working with the repairmen - four visits later, we isolated the float assembly as the problem and they set about replacing the part. Turns out the two parts were markedly different. LG HAD INSTALLED an older model float assembly at the factory and it was the problem. The replacement part was the correct float assembly and things worked perfectly after that - thank goodness. No more babysitting the dishwasher.

Don't let anyone tell you the motor assembly needs replacement. I have seen that cop-out 'fix' all over the web. But use deductive reasoning to find out where the problem is in the cycle, and explore this option first - it's a quicker and cheaper fix than replacing the whole motor assembly.

'Mr. Float' as he is now called works like this:
-expels any residual water in the tub from the last wash
-intakes water for the wash or rinse
-whirs 2-3 times prepping for the cycle
-begins to wash, quietly
-expels at the end of the wash or rinse.

He used to:
-expel residual water
-intake new water for wash or rinse
---drain pump would cut in WHILE still filling
-machine would whir once, realize it didn't have enough water
-perform a brief top-up intake shot
-begin to wash and whistle and GRIND (this is where I would have to add the water)
-expels water from wash or rinse, and start all over again.

It's a good dishwasher and it will work, but the right model parts have to be in place!

Posted on Jun 02, 2011

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LG dishwasher model LDF7551ST wont start up - this symbol lights up (lock with smileyface) says "upper" next to it - what do i do to reset / restart?


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2 Answers

Where can I get a float assembly for my LG dishwasher LDF7551ST?


Try some of these sites on line
Sears Parts
V & V appliance parts
Repair clinic
Marcone Appliance parts

Feb 28, 2015 | LG Dishwashers

1 Answer

The installation guide does not match lg LDF7551ST dishwasher.


The feet are usually adjusted by turning them left or right to adjust their height.

Thank you for contacting Fixya. Does this help? Let us know.

Ponder/Meditate/Pray for Peace.

Mary Oliveau { hugs }

Feb 22, 2014 | LG Dishwashers

1 Answer

My lgis making a horrible noise and is now shoeing an e1 code dishwasher


The LG does suffer from "poor quality" motor that causes this type of noise. The main motor and pump assembly is common to give this type of problem. The pump seal leaks a small amount of water that gets onto the front bearing and causes a "grinding = humming" noise. This can be easly replaced once you have the bottom off and dishwasher on its door. The motoe has 1 screw in the back holding the motor to the bottom and two rubber seals for the water pump in/out into the washer. Just pull and move motor and pump assmbly and it comes free. Replace with a new motor and pump assembly...

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First, remove the sump cover in the bottom of the tub to check if any object (like a part of a broken glass or plate) is being knocked around by the impeller or hard food cutter blade. (Note: The screw on the end of the motor shaft has a left hand thread) If nothing found there, then continue on to replace motor by removing dishwasher from cabinet and laying it on it's side to access motor. (sometimes bits of the permanet magnets in the motor break off, causing noise)

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check to see if the load noise is coming from the motor that is attached to the sump if it is replace the motor and sump together as one unit if you buy them seperatly youll end up paying almost twice as much for the single pieces take off the bottom panel to inspect where the loud noise is coming from

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