Bosch Dishwasher Keeps Making Noise- Easy Fix

Bosch dishwasher
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The dishwasher is widely used to clean dirty utensils and other kitchen equipment. Sometimes, the dishwasher may start making noise when in use or not in use. Also, the dishwasher may produce strange sounds such as continuous hissing or loud noises. Usually, the noise causes discomfort or irritation, especially at night when an individual desires rest.

Fixing bosch dishwasher noise is easy and requires little understanding of the parts of the dishwasher and how they function, such as how the pump impeller works. This article briefly describes the causes of bosch dishwasher noise and various ways of troubleshooting such problems.

Causes of dishwasher noise and how to troubleshoot them

bosch dishwasher making noise

Several reasons cause the bosch dishwasher to produce noise when in use or not in use. If the problem is ignored, it can severely damage the dishwasher. First, to troubleshoot the issues, identify the main cause of the dishwasher making noise and try fixing them depending on the cause of the problem. Therefore, it is vital to troubleshoot the problem immediately instead of ignoring it. The information below shows the main reasons for the bosch dishwasher making noise and troubleshooting each cause.

1. Fault dishwasher drain pump

bosch dishwasher drain pump

The dishwasher drain pump is essential in draining dirty water from the device during the washing process. Once the dishwasher is turned on, the dishwasher drain pump engages and removes dirty water present in the pump giving space for re-entry of clean water. Sometimes, the dishwasher drain pump may become faulty and produce some funny noise during the cleaning cycle.

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A faulty drain pump may result from the presence of equipment in the drain pump, such as glass pieces, bones, and accumulation of undrainable dirt, among others. Also, a faulty drain pump is a result of a broken drain pipe. Finally, the drain pump may crack or break, making the drain pump fail to function, thus producing a funny sound.

Troubleshooting a faulty dishwasher drain pump is easy as long as you follow the recommended steps. The information below shows the step-by-step process of troubleshooting a defective drain pump.

i. First, inspect the drain pump to detect any issues. Examine not only the drain pump but also the whole dishwasher.

ii. Disconnect the drain pump from the machine before beginning the repairing process. While disconnecting the drain pump, handle the dishwasher components carefully to avoid distorting them.

iii. If the drain pump is filled with broken glass or crockery chips, open the pump and remove all dirt from the drain pump and clean it using the recommended agent such as distilled vinegar.

iv. After cleaning, rinse the pump and leave it to dry.

v. Reinstall the drain pump back to its position and turn on the dishwasher to see if the problem is resolved.

vi. If the drain pump is broken or has some cracks, consider replacing it with a new drain pump that suits the dishwasher. Also, ensure the replacement drain pump is of high quality and functions properly.

vii. If the problem persists, the problem might be from other dishwasher parts or consider replacing the whole dishwasher.

2. Distortion of the wash motor

The dishwasher may produce funny or unwanted noise due to a distorted wash motor or recirculation pump. A Wash motor is also a key component of the dishwasher which drains water collected at the bottom of the machine during the cleaning cycle through spray arms. If you experience the dishwasher producing funny noise, consider checking the wash motor and fixing the problem using the following step.

  • Disconnect the recirculation pump from the dishwasher by using a screwdriver and a wrench to unscrew all screws in place. If the screws have accumulated a lot of rust, consider cutting the bolts using a bolt cutter or a mini-hacksaw.
  • Disconnect the wash motor from the main components.
  • Inspect the status of the wash motor to detect any faults.
  • If the wash motor is broken, consider sealing the cracked area using sealing tape.
  • If there are unwanted substances such as organic debris, remove the substances and clean the wash motor using appropriate detergent.
  • Test the pump to see if the problem is resolved after reinstalling it back to its position.
  • Sometimes, the problems may persist. In such circumstances, consider replacing the wash motor or contact a skilled plumber to help you fix the wash motor problem.

3. Damaged water inlet valve

bosch water inlet valve

The water inlet valve allows clean water to flow into the dishwasher. The valve functions well at the beginning, but with time, it wears and deteriorates. During the wearing process, the water flowing into the dishwasher comes in contact with deforms, resulting in a loud buzzing and squealing noise.

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Fixing the problem is easy and requires the following steps;

  • Disconnect the dishwasher from its location by unscrewing all screws using a screwdriver and a wrench.
  • Disengage the water inlet valve and inspect it carefully for any deforms. If the valve is new and damaged, consider repairing it or contacting skilled personnel to help you fix it.
  • Replace the water inlet valve if it is too old and unfixable.

4. Dishwasher wash impeller

The wash impeller functions by forcing the water out of the dishwasher through the spray arm. If the wash impeller breaks, loud buzzing noise will be generated. The problem is only fixed by replacing the wash impeller with a new one. When replacing the wash impeller, buy one that suits the dishwasher and is recommended by the manufacturer. But, if the wash impeller is inbuilt and cannot be replaced separately, consider replacing the whole drain pump and wash motor components.

5. Spray arm hitting dishwasher utensils

Spray arm

Once the spray arm hits the utensils present in the dishwasher due to incorrect utensils loading, a knocking or rattling noise, as a result, is generated. Too many utensils in the dishwasher prevent the spray arm from rotating properly.

Troubleshooting rattling noise issues requires proper loading of dirty utensils in the dishwasher. Proper loading allows the spray arm to rotate well during the washing process. Also, remove the utensils from the dishwasher by cleaning and arranging them in their appropriate place. If the spray arm breaks, consider replacing it with a new one that suits your dishwasher. Finally, rearrange the loaded utensils tightly to the dishwasher bucket to avoid obstructing the spray arm.

6. Ending of the dishwasher program

When the dishwasher program ends, the dishwasher produces a beeping noise that notifies the user concerning the program. The beeping noise may be loud depending on volume settings. To fix the beeping noise issue, consider programming the dishwasher by following the manufacturer’s instructions before the program ends. Also, keep the dishwasher volume low as possible to avoid beeping noise distractions.

7. Dishwasher bearing

Dishwasher bearing ring

Sometimes, the bearing may become faulty and fail to function, as usual, thus producing loud noise. To fix such a problem, inspect the bearing and replace it with a new one. To check the bearing, follow the steps below;

  • Disconnect the machine by unplugging it from its location.
  • Find the position of the bearing ring; they are commonly joined with the spray arms.
  • Examine the bearing for any deformities like wear, cracks, among others.
  • After examining the condition of the bearing ring and identifying any defects, consider replacing the bearing ring.


Bosch dishwasher noise generation can be irritating, especially when performing other activities. Sometimes the dishwasher may produce too much noise due to the failure of the dishwasher components. The dishwasher noise troubleshooting process depends on the cause.

Luckily, the article above describes the main causes of bosch dishwashers making noise and the necessary steps of troubleshooting each problem. If your bosch dishwasher begins producing noise, use the above information to bring the dishwasher to its normal functioning successfully. Finally, consider following the manufacturer’s instructions during the troubleshooting process.

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