Top arm stopped rotating on Bosch clasixx

There are a few things that can cause this.
If there are no error messages being displayed during the cycle, the most common ones are:
1) Loose Impeller on the motor rotor. Check it by removing the drain filter, dish rack, spray arm and main wash filter (the giant stainless steel circular one), then twist the motor to the left and it should just pop out. If you hold the bottom of the motor in one and and the larger impeller on top freely spins, this is your problem.
2) Crack in the side of the spray arm. If the spray arm is separated, then the water pressure will being spraying sideways, rather than up to your dishes.
3) Too much fat or protein built up inside. This happens when you put too much eggs and milky stuff in there. Just run it for a cycle with detergent but no dishes. DO NOT use one of those dishwasher cleaner things in a dish drawer, they do more harm than good due to the fact that they are designed for a dishwasher with double the capacity of yours.

list given is the wrong stuff to clean any dishwasher
LG LDF6920ST Dishwasher
thats an old dishwasher now
use recommended dish washer cleaners regularly
off the shelf deodoriser and sanitizes on an full empty cycle

check the filter at the bottom is kept clean each load clean
temp of wash water may no be enough
helps if you wash off any food stuffs on articals with hot water before placing in the dishwasher

Make sure the center loading is not obstructing the water jet to the top shelf. Top shelf is only for glasses and saucers , use Jet-Dry .Pre rinse and clean bottom pan strainer from dirt debris.

Hi, I have an older dishwasher also and recently mywife also complained about it not cleaning right... so me being the man I amtried in vain to clean the things... Bought new spray arms online and installedthem in minutes...now the thing works like new... However I have also foundthat if the heating element goes bad then that also can mess things up bad...So I would buy new spray arms, and also check out the heating element to makesure it is working... Here is a tip that will help you with the onlinebuying...
Dishwasher SprayArms not Spinning

How to Buy ApplianceParts Online

A bad heating element causes many problems in dishwashers...

Dishwasher Problems The HeatingElement not Working

DishwasherMaintenance DishwasherResidue and Film on Dishes

heatman101

Asker's Testimonial "explanation very clear. will give it a go and see howsimple it was. thanks Ronnie " - ronnieshomes

Do you have hard water? Many states have passed laws that outlawed phosphate as an ingredient in dishwasher detergent. If you have hard water, the detergents don't work very well anymore. The residue is probably hard water deposits (calcium and magnesium). Not harmful but it looks awful on your dishes. There are some new products that were designed to solve this exact problem. They are inexpensive and effective. Can't say the name or I'll get banned (again). Internet search will uncover it.

Hi, I have an older dishwasher also and recently mywife also complained about it not cleaning right... so me being the man I amtried in vain to clean the things... Bought new spray arms online and installedthem in minutes...now the thing works like new... However I have also foundthat if the heating element goes bad then that also can mess things up bad...So I would buy new spray arms, and also check out the heating element to makesure it is working... Here is a tip that will help you with the onlinebuying...
Dishwasher SprayArms not Spinning

How to Buy ApplianceParts Online

A bad heating element causes many problems in dishwashers...

Dishwasher Problems The HeatingElement not Working

DishwasherMaintenance DishwasherResidue and Film on Dishes

heatman101

Asker's Testimonial "explanation very clear. will give it a go and see howsimple it was. thanks Ronnie " - ronnieshomes

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Hi, I have an older dishwasher also and recently mywife also complained about it not cleaning right... so me being the man I amtried in vain to clean the things... Bought new spray arms online and installedthem in minutes...now the thing works like new... However I have also foundthat if the heating element goes bad then that also can mess things up bad...So I would buy new spray arms, and also check out the heating element to makesure it is working... Here is a tip that will help you with the onlinebuying...
Dishwasher SprayArms not Spinning

How to Buy ApplianceParts Online

A bad heating element causes many problems in dishwashers...

Dishwasher Problems The HeatingElement not Working

DishwasherMaintenance DishwasherResidue and Film on Dishes

heatman101

Asker's Testimonial "explanation very clear. will give it a go and see howsimple it was. thanks Ronnie " - ronnieshomes

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All the jets must be clean especially the drive jets at the ends of the wash arms, these drive the arms around thus allowing jets of water to reach every piece of crockery.

Carefully inspect the lower spray arm for a crack or separation.
Also inspect the holes in the spray arm that may be stopped up with debris.
Remove and clean the filter in the front center of the tub.
Set the spray arm at the 12 o'clock position and start the washer. After 30 seconds open the door and check the position of the spray arm. Do thi several times to confirm the spray arm is rotating.

you have a clog remove the float clean and replacs,sould work now.