Question about LG LDS4821ST FuConsoDishwasher with Digital Status 4 Wash Cycles

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Lg lds4821st making a whistle noise in wash cycles

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4 Suggested Answers

6ya6ya
  • 2 Answers

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

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Posted on Jan 02, 2017

  • 423 Answers

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

  • 1 Answer

SOURCE: My 5 month old LG dishwasher is making a high

Good day-

I am the proud owner of a LG LDF6920WW. I bought it 10-2008 and it developed a high pitched sqeel (HPS) exactly 2 years and 3 months later. It first occurred on a monday and repeated on the following Wednesday. After the water filled the machine and the swirling, pumping, cleaning cyale began, the HPS began and lasted until the drying cycle. I searched the internet and determined that this HPS was occurring anywhere from 5 days of being purchased, up until the 2 year mark. I was weary of believing that a motor would fail in a five day period as well as last for up to 2 years, so I "Googled" parts for my model and looked at the scematic or parts break down chart. Refering to the chart, I began to disasemble my dishwasher after removing it from the cabinet and taking it to the garage.

I focused on the sump assembly. I removed all parts, motors, baffles, bladders, check valves, etc. I thougroughly cleaned all pieces and parts with windex and a scotch/sponge. I removed all food and debris from all surfaces and gaskets. I cleaned the main body cover by using a low pressure hose and alternating cleaning the top and bottow. I made sure not to rip the micro screening. Upon re-assembly I used high heat, automotive bearing grease to lubricate the seals where motor shafts protruded through them. ****Important**** I set the clutch setting at 3 on my electric drill to screw the assembly back together. I also disassembled the water inlet valve and the float assembly on the left side, exterior of the dishwasher and cleaned that completely out. I flushed all hoses as well.

I put it back in, connected all water, electricity and back-flow devices. The dishwasher is once again silent. All motors and bearings seemed fine. During tear down, the only problems I found were: 1) A lot of debris in several places. 2) dry gasket to shaft surfaces.

Posted on Jan 23, 2011

  • 1 Answer

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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1 Answer

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!

Jun 27, 2009 | LG Dishwashers

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