It is usually due to a lid spring problem or the solenoid operating the lid is faulty. In any case you need to replace the whole dispenser assembly. It looks like this (item K001) in this assembly chart.
http://www.appliancepartspros.com/section-4-parts-for-lg-ldf8812st-asteeus.html
To save hassles it might be worth switching to the dishwasher tablets instead of the powder. You simply drop the tablet in cutlery basket. A good brand like Finish should do you wonders. Might seem a bit expensive per wash but you extend the life of the dishwasher due to its cleaning efficiency.
SOURCE: LG DISHWASHER
This is a common fault if your drain hose or the drain pipework after it is blocked by tissues or fluff etc remove the drain hose from the vertical drain pipe or u-bend connection and check that all are free of obstructions. Also a lot of machines have a filter located at the bottom of the machine either behind a flap at the front or located near the pump at (usually) the back of the machine underneath. This can be got at by either removing the back panel if there is one or tilting the machine forward to access it from underneath chock the drum with wood to avoid drum suspension damage or re- attach the drum bolts which were removed when the machine was delivered if you still have them. The pump will have a rubber hose attached before it and the pump is connected to the machine end of the drain hose, often the rubber hose is large bore and incorporates a hard plastic filter designed to trap buttons coins etc before entering the pump and damaging the impeller blades, remove any debris.
In essence you are making sure the the whole drainage route from the drum to the final drain point is clear and free flowing.
SOURCE: LG Dishwasher model LD-1415M. Detergent
First off, clean the detergent dispenser as best you can using white vinegar.. make sure you get any and all left over soap deposits off the cup and edges of it then,... try cycling the dishwasher without any dishes on the hottest setting and after it is about ten minutes into the cycle.. pause it and add two cups of white vinegar inside the dishwasher.. That should remove most , if not all left over deposits from the system. See if that frees up the dispenser .. Make sure the drain filter is has been cleaned thoroughly prior to running this process.. Hope this helps...
SOURCE: water leaking from dishwasher lg model lds5811ww
The drain line is clean. Have you checked to make sure the the rest of the drain is clear all the way down to the main drain?. Also check the pump to make sure that it is working properly, it might be pumping water in, but it may not be wanting to pump the water out
SOURCE: Soap block not releasing while washing
I urge you to only use Electrosol or Cascade powder with your (or any) dishwasher. Most ultra-cheap powder will not clean effectivly. If the dispenser does not open with the powder inside, a service call is the next step.
If you reply, please tell me the Make and model of your dishwasher.Good Luck!
SOURCE: LG dishwasher is making loud grinding sounds
debris in pump. unplug and disassemble pump. clean out and reassemble
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