I had the same problem. The motor had to be replaced. For as much as we paid for this it has not lived up to the Bosch name. It's never been as quiet as other people talk about, and then the motor went out! It's only 2 years old.
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Have you cleaned the traps and run some vinegar through? They build up dirt from kitchen debris over time which causes the pump and spray rails to pick up sludge. You need to clean them at least every 6 months. Check farther on line for cleaning solutions to clean and maintain dishwashers. I have been hearing clr can be used but can't confirm this.
If you are noticing that the dishes are not clean, then there are a few things to check for. Check the soap powder if it's kept in a dry environment. Also try replacing the powder with something like a gel or liquid. Next thing to check for is the water pressure and fill valve. Check if the water is filling in and the spray arms are throwing the water with enough pressure. Try and listen to the sound if you hear a proper spraying action sound.
If it seems as a low water pressure then check the fill valve. Now, check if dishwasher is draining the water or not. While the dishwasher is working check whether the dishwasher is draining and there is not much left out water after the cycle is complete. Try cleaning the spray arm with a soft brush. The water temperature plays a major role in cleaning of dishes. The temp should be between 125 and 150 F for dishwasher to clean the dishes. Hope this helps...
You likely have food or soap buildup stuck behind the trap in and around the drain workings. The only remedy it to remove the trap cover or lower arm assembly, and start poking around. The food finds its way into the tiniest of places and sits there, but it dirties up the rinse cycle. I have to clean mine out about once per year.
It all stems back to your incomming water supply. Either the sieve is dirt or the valve is blocked with sedementation. Some valves are servicable and some are not,if your valve has screws then its revicable. (low water pressure restricts movement on arms.)
The problem is hard water. There is a new product out called the dishwasher filtration system.It filters the water before it enters your dishwasher. It works amazing and has a money back guarantee.You will love the way your dishes look after the first load. It is also very affordable (like 70 bucks). Go to www.dishwasherfilter.com to find out more info.
your model is pretty new. just so you know your warrenty is 1 year parts and labor. 2 years on parts. it should not cost that much money.
there are two components that start before the circulation pump.(wash noise you hear)
first sounds you hear will be the drain pump. usually rattling noises if something is in it but it can make a hum noise if something is jamming the drain propeller up. which is accessible with a T20 torx driver. take the filters out and the mesh filter. and unscrew the screw in the base towards the left. pull out whatever is lodged.
the other humming sound can come from the next component that activates is the watervalve. make sure you dont have a kinked water intake line. otherwise its a bad valve. i have had to change a few of those water valves out already but not for a hum noise on your model. you have a new style water valve. when brands make new parts we get problems fast sometimes..
if you have a torx 20, and torx 15 screw driver, you an remove the screws from the top plate of the wash motor, and underthere youll see another t15 screw converingthe "chopper" assy, sounds as if a seed, of chicken bone, perhaps apiece of glass hasgottne down there
How deep do you want to get into this?It sounds like the wash pump motor bearings that are worn.You can pull the unit out flip it over and wd40 the bearings in the motor or you can replace the bearings.Try to lube them first.
It could be the impeller on the motor. The impeller fits over the shaft of the motor and might have split/broken up. That funny noise is probably the shaft spinning inside the damage impeller. Fortunately the impeler is fairly inexpensive and easy to replace. I believe there are one or two parts/covers to remove that are held in by a roughly half dozen torx screws.