Bosch Dishwasher Hums But No Water- fix

Troubleshooting a Bosch Dishwasher That Hums But Doesn’t Fill with Water
Encountering a situation where your Bosch dishwasher emits a hum but fails to fill with water can be perplexing. In this comprehensive guide, we’ll take you through a step-by-step process to understand the root causes of this issue and provide effective solutions to get your dishwasher back to its efficient operation.

Understanding the Significance of Water Filling

Proper water filling is a fundamental step in the dishwasher’s cycle. Without sufficient water, your dishes cannot be effectively cleaned, leading to unsatisfactory results and wasted cycles. Addressing the issue promptly ensures that your dishwasher consistently delivers sparkling clean dishes.

Common Signs of a Humming Bosch Dishwasher Not Filling

  • Audible humming sound during the cycle, but no water enters the dishwasher.
  • Dishes remain dirty and unchanged after running a full cycle.
  • Unfinished cycle with detergent residues on dishes.
  • Visible error codes on the dishwasher’s display panel.
  • Recognizing these signs will assist you in pinpointing the problem and taking the necessary steps to resolve it.

Potential Causes of the Humming and Filling Issue

Water Supply Issues


Insufficient water supply due to valve blockage, kinks in the water supply hose, or a closed water supply valve.


Inspect the water supply hose for kinks and ensure it’s properly connected. Check the water supply valve’s position and clear any blockages.


No cost if it’s a simple hose adjustment; otherwise, valve replacements may range from $20 to $60.

Faulty Water Inlet Valve


A malfunctioning water inlet valve can prevent water from entering the dishwasher despite the humming sound.


Test the valve’s electrical continuity with a multimeter. If it’s not functioning, replace it with a compatible replacement valve.


Water inlet valve replacements are typically priced between $25 and $50.

Clogged Filters and Spray Arms


Accumulated debris and particles in the filters or spray arms can obstruct water flow.


Remove the filters and spray arms, clean them thoroughly, and ensure there are no blockages.


No cost for cleaning, but replacement parts for damaged filters may range from $10 to $20.

Step-by-Step Troubleshooting Guide

Initial Checks and Safety Precautions

  1. Turn off power: Disconnect the dishwasher from the power supply to ensure safety during troubleshooting.

Inspecting Water Supply

  1. Check water supply hose: Examine the water supply hose for kinks, bends, or obstructions that could affect water flow.
  2. Inspect water supply valve: Ensure the water supply valve leading to the dishwasher is fully open.

Testing the Water Inlet Valve

  1. Access the valve: Depending on the dishwasher model, locate the water inlet valve.
  2. Test the valve: Use a multimeter to test the valve’s electrical continuity. If it’s faulty, consider a replacement.

Cleaning Filters and Spray Arms

  1. Remove filters: Take out the dishwasher’s filters, which are typically located at the bottom of the tub.
  2. Clean filters: Rinse the filters under running water and remove any debris or particles.
  3. Clean spray arms: Remove the spray arms and clean out any clogs or blockages.

DIY Fixes and Preventive Measures

Adjusting Water Supply Hose

Pros: Simple solution that can quickly restore water flow to the dishwasher.

Cons: May require occasional checks and adjustments to ensure proper water supply.

Cleaning and Maintaining Filters

Pros: Improves water circulation and dishwasher performance, preventing future issues.

Cons: Involves regular maintenance to keep filters clean and free from debris.

Additional Considerations and Solutions

Check for Debris in the Sump


Debris can accumulate in the sump, affecting water flow and causing the humming sound.


Remove the sump cover, clean out any debris, and ensure the impeller can move freely.


No cost if you can clean it yourself; otherwise, professional cleaning might involve a service fee.

Inspect the Float Switch


A malfunctioning float switch can prevent the dishwasher from filling with water.


Test the float switch for proper functionality using a multimeter. Replace if needed.


Float switch replacements typically range from $10 to $30.

Seeking Professional Assistance

When to Consult a Technician

Pros: Expert technicians can diagnose complex issues and provide accurate solutions.

Cons: Involves additional cost compared to DIY efforts and may require scheduling for repairs.

Identifying Internal Component Problems

Pros: Professional assessment ensures accurate diagnosis and effective resolution of internal component malfunctions.

Cons: Might require ordering and waiting for replacement parts before repairs can be completed.

FAQs (Frequently Asked Questions)

Q1: Is it safe to attempt troubleshooting if the dishwasher is humming?

A1: Yes, you can follow the provided troubleshooting steps to identify and address the issue. Ensure the dishwasher is disconnected from the power supply for safety.

Q2: What could be causing a water inlet valve to malfunction?

A2: Water inlet valves can malfunction due to electrical issues, mechanical failures, or debris accumulation. Testing the valve’s continuity will help determine if it’s the cause.

Q3: Can a clogged spray arm affect the dishwasher’s performance?

A3: Yes, a clogged spray arm can hinder water distribution and result in ineffective cleaning. Regularly cleaning the spray arms ensures optimal dishwasher performance.


By following this comprehensive guide, you’ll be well-prepared to troubleshoot and address the issue of your Bosch dishwasher emitting a humming sound but not filling with water. Whether you’re adjusting water supply components, testing the water inlet valve, maintaining filters, checking the sump, or inspecting the float switch, you’re on the path to restoring your dishwasher’s functionality and ensuring that your dishes come out sparkling clean once again. Remember to prioritize safety, take preventive measures, and explore every potential solution for a thorough resolution.


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