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Is the door opening ? if so make sure you are not putting things in front of it to prevent it from opening completly. If not you may have a dispenser or control issue. also are all the dishes getting wet? if not you would have a sump motor issue or you are not getting any water at all.
1.) Confirm that the holes of the spray arms are not blocked with debris.
2.) Run a short cycle with an empty dishwasher and no dishwasher soap. Run the dishwasher until you hear it finish filling with water and begins the wash cycle. Add up to two cups of white vinegar to the water and allow to wash and drain. Feel free to do the same when the dishwasher fills again.
3.) Only use a brand name powder detergent (e.g. Electrosol or Cascade) in any dishwasher. Do not use a gel or tablet in any dishwasher. Do not fill the dispenser fully.
Test your dishwasher with a standard load of dirty dishes.
If problems continue, confirm that the heating element is working properly. The heating element is vital to getting clean dishes with modern dishwashers and DW detergent.
Please report back what you find.
Recommend you stop using the gel and switch to a brand name powder - like Electrosol or Cascade. Never use gel, gel packs or tablets in any dishwasher. Avoid untra-cheap, generic powders.
If problems continue, a service call, with them checking that the heating element is working is the follow up step.
The LG 7811 dishwasher is supposed to even support a cold water (vs. hot water) connection. Then it will heat the water up to 120 degrees upon each fill cycle. This is not optimal and it adds much time to the already long full cycle. When you run the hot water at the kitchen sink until it is hot and then kick off the cycle, is the water hot at the beginning? It should be 120 degrees minimum and well under 140 degrees maximum.
Do you get any error codes on the display?
Troubleshooting is possible, but recommend you contact LG service at the number in the user guide asap. Press for fast, free resolution to this problem. Please reply when you have gotten this fixed, explaining what fixed this nice, quiet dishwasher. Good Luck!
PS: When you get it running, do not use ultra-cheap dishwasher soap. Recommend Electrosol powder or cascade. Never use gel or tablets on this water conserving dishwasher.
Symptoms: Dispenser lid is open. Caked powder at (what would be during normal
operation) bottom edge of soap dispenser or caked powder fallen onto
dishes or dishwasher bottom. There may be loose powder in rest of
dispenser or spilled down inside door or onto dishes underneath
Keep the area around the soap dispenser lid clear when loading the top tray.
The soap dispenser needs to swing open during the wash cycle. In many
dishwashers the top tray has an indentation as wide as the lid of the
dispenser. This allows the top tray to be as large deep as possible
while still allowing space for the dispenser lid to open. People often
pack their dishwasher with things overhanging this gap.
During the wash cycle the catch will release but the overhanging cutlery
or crockery prevents the lid from opening all but a few degrees. Some
water will splash in but not enough to wash out the soap powder. The
soap powder at the bottom of the dispenser will then cake.
When the front door is opened the spring loaded lid, which is partly
open, will of course swing fully open and you'll be convinced that the
lid opened normally during operation. If this is the problem then if
you're very careful and open the door very slowly you can actually hear
the lid flip open. Also, depending on when the lid opens, how far it
opened during operation and how fast you open the door you may find soap
powder spilled down to cover the dishes at the front or down the inside
of the door. This happens when you first open the door and obviously
there couldn't be loose powder there if the powder had emerged while
there was water washing around. Seeing the lid open as you open the door
is a lot harder but can be done on some machines.
With the LG LDS5811 dishwasher and other water/energy saving dishwashers, they are VERY ineffective with untra cheap powder detergent. Switching to Electrosol or Cascade has solved the problem -- and don't use too much.
If you add a whole house water softener, you will be AMAZED how much better your dishwasher and clothes washer work -- especially if your cut down on the amount of detergent your use.
Oh, never use gel or tablets in your diswasher. Ever.
if the problem with the detergent dispenser not opening is a seperate problem. Recommend you submit a seperate problem/question.
I have the same dishwasher and kept having soap still in the dispenser at the end of the wash. Someone mentioned this, but what was happening is that the soap dispenser lid was blocked from fully opening by the top rack. You also typically have large pans in this area, so the water spray is blocked from getting under the half open lid well. I started opening the dishwasher after I heard the dispenser latch release, so the lid could fully open. After that, I had no problem with soap still in the dispenser. I started setting a timer to open and shut the dishwasher door about 20 minutes into the wash process (after the latch had released for the 2nd wash cycle), so the soap dispenser lid would be fully open. This was a pain, but it worked. The other thing to be careful of with this dishwasher is to ensure you have pushed the top rack in tight before closing the door. Look at the water connection for the top "spinner" and you will see how the plastic pipe fits up to the supply. If you don't have the rack pushed in tight, you get leakage around the connection and don't get good water spray from the top spinner arms. This can definitely affect the quality of the wash. You mentioned the dispenser lid is open when the cycle is complete, but that is because once you open the door it can fully open.
Ginga, first of all it's still under warranty so I would call for service. Here's a few things to consider; first, I would switch back to the powdered detergent like Cascade. You want to make sure that the water entering the dishwasher is at least 120 to 150 degrees, anything less will cause the detergent not to dissolve. Check your loading and make sure nothing is blocking the spray arms from the soap dispenser. Make sure the spray arms do not have any cracks or splits. After the dishwasher fills, make sure that the water level is right at or just below the heating element, a short fill will cause this also. Catriver...post back.