Dealing with a dishwasher that hums but doesn’t fill with water can be frustrating. But don’t worry! This fairly frequent issue can be easily handled with a few simple remedies.
In this post, we’ll guide you through 11 simple and practical ways to fix your dishwasher when it’s buzzing but not filling with water. These answers have been compiled from credible sources and professional guidance to provide various possibilities.
Whether it’s a faulty pump motor, a damaged door switch, or a clogged dishwasher filter, we’ll guide you step-by-step through troubleshooting. You don’t have to be a repair specialist or shell out a bunch. With a few necessary tools and some time, you can get your dishwasher back up and running.
Why Does Your Dishwasher Hums But There is No Water?
A dishwasher may hum but not fill with water due to various reasons. Here are a few possible causes:
1. Damaged Door Switch
A damaged door switch can prevent the dishwasher from filling with water.
The door switch controls the dishwasher’s operation when the door is opened or closed. If the switch is faulty, it may disrupt the water flow.
Checking the door switch with a voltmeter and replacing it if necessary can resolve this issue.
2. Faulty Water Inlet Valve
A malfunctioning water inlet valve is a common cause of a humming dishwasher with no water.
The water inlet valve controls water entry into the dishwasher and is typically regulated by an electronic timer.
If the valve is damaged, cracked, or worn out, it may fail to fill the dishwasher with water. Inspecting the valve and replacing it if needed can restore proper water flow.
3. Malfunctioning Float
A broken or bad float switch can contribute to a dishwasher humming without water.
The float is a safety device that prevents overfilling by signaling the water valve to shut off the water supply when the water level reaches a specific threshold.
If the float is damaged or stuck, it may disrupt the proper filling of the dishwasher. Checking the float for smooth movement and replacing it if necessary can resolve this issue.
4. Pump Motor Failure
Pump motor failure can result in a humming dishwasher without water. Regular dishwasher usage helps prevent moisture buildup that can lead to pump motor failure.
If the dishwasher pump motor malfunctions, it may prevent it from filling with water. While a temporary solution can be achieved using 4 ounces of citric acid and a hot water mixture, replacing the pump motor is often necessary for a permanent fix.
5. Blocked Inlet Valve
A blocked inlet valve is another potential cause of a humming dishwasher with no water.
Lime deposits, often caused by hard water, can obstruct the flow of water through the inlet valve, impeding the proper filling of the dishwasher.
Checking the inlet valve for lime buildup, removing the deposits, or replacing the valve if necessary can restore the water flow.
6. Clogged Spray Arms
Clogged or blocked spray arms can restrict water distribution inside the dishwasher, leading to a humming sound without proper water flow.
Food debris, mineral deposits (calcium deposits), or other obstructions can accumulate in the spray arms over time.
Cleaning the spray arms and ensuring they rotate freely can help restore water flow and resolve the humming issue.
7. Defective Water Supply Line
A defective water supply line can hinder the dishwasher from filling with water.
A kink, blockage, or leakage in the water supply line can disrupt the water flow and result in a humming dishwasher.
Inspecting the water supply line, removing any obstructions, and repairing or replacing the line as needed can resolve this issue.
8. Clogged Filters or Drainage System
Clogged filters or a blocked drainage system can interfere with the proper functioning of the dishwasher, leading to a humming sound without water.
Accumulated debris, food particles, or mineral deposits can obstruct the filters or the drainage system, impeding water flow.
Regularly cleaning the filters, removing debris, and clearing the drainage system can help restore proper water flow and resolve the humming issue.
9. Faulty Water Inlet Solenoid
A malfunctioning water inlet solenoid can also be responsible for a humming dishwasher with no water.
The solenoid is the device responsible for controlling water flow into the dishwasher.
If the solenoid is defective or fails to operate correctly, it may hinder water from entering the dishwasher.
Inspecting and replacing the solenoid can help restore the water flow if necessary.
10. Timer or Control Board Issues
Malfunctions in the dishwasher’s timer or control board can affect the water fill cycle, leading to a humming sound without water.
The dishwasher may not receive water if the timer or control board fails to send the proper signals to initiate the water fill process.
Checking for error codes, resetting the control board, or replacing the timer or control board can resolve this issue.
11. Faulty Pressure Switch
A faulty pressure switch can cause a humming dishwasher without water.
The pressure switch is responsible for detecting the water level in the dishwasher and controlling the water fill cycle.
If the switch malfunctions or becomes stuck, it may disrupt the water flow and result in a humming sound.
Checking the pressure switch for proper functioning and replacing it if necessary can help resolve this problem.
12. Wiring or Electrical Issues
Problems with the dishwasher’s wiring or electrical connections can also contribute to a humming dishwasher without water.
Faulty wiring, loose connections, or damaged electrical components can disrupt the water fill cycle.
Ensuring all electrical connections are secure, inspecting the wiring for any damage, and addressing any electrical issues can help restore proper water flow.
How to Fix a Dishwasher Humming But With No Water?
If your dishwasher is humming but not filling with water, there could be several possible causes for this issue.
Here are some measures you may take to investigate the issue and perhaps solve it:
1. Check the Door switch
If the door switch is broken, the dishwasher may not fill with water.
Use a voltmeter to test if the door switch is the source of the problem. If it is malfunctioning, you may need an expert to replace it.
2. Inspect the Water Inlet Valve
The water inlet valve is the device responsible for allowing water to enter the dishwasher.
If it is obstructed or not working properly, water may not be able to pass through it.
Switch the dishwasher and shut off the water supply before inspecting the valve. Next, locate the valve and look for wear or damage. It needs to be replaced if it is damaged.
3. Clean the float
The float assembly is a safety feature in the dishwasher that prevents it from overfilling with water.
If stuck in the up position or damaged, it can prevent water from flowing into the dishwasher.
First, unplug the dishwasher and remove dishes or debris from the bottom to clean the float. Then, locate the float and manually release it to see if it moves up and down properly. If it is damaged, it will need to be replaced.
4. Replace the Pump Motor
The dishwasher won’t be able to fill with water if the pump motor is malfunctioning.
Remove dishes from the dishwasher and pour hot water and citric acid into the bottom to fix this issue. Let it sit for a while before re-running the dishwasher.
If the problem persists, the pump motor may need to be replaced.
5. Clear Clogged Filters or Drainage Systems
Water flow may not be optimal if the dishwasher’s filters or drainage system are blocked.
Remove any accumulated debris or food particles from the filters and drainage system to fix this issue. Use a clean, soft brush or cloth to gently remove any clogs, being careful not to damage any parts.
Regularly cleaning the filters and drainage system can help prevent future clogs.
6. Unblock the Water Supply Line
A blocked or kinked water supply line can prevent water from reaching the dishwasher.
Ensure the dishwasher’s water supply line is not twisted or obstructed by checking it. Straighten out any kinks and remove any obstructions to allow proper water flow.
7. Inspect the Water Pressure
Low water pressure can also contribute to a dishwasher not filling with water.
Check your home’s water pressure to ensure it is sufficient for the dishwasher to operate effectively. To fix the problem, if the water pressure is low, you should call a plumber.
8. Verify the Float Switch Mechanism
The float switch is responsible for detecting the water level in the dishwasher.
It can prevent water from entering the dishwasher if it is not functioning correctly.
Check the float switch for any visible damage or debris that may be obstructing the float switch. Clean or replace the float switch as necessary.
9. Examine the Water Inlet Hose
A twisted, clogged, or damaged water inlet hose can restrict water flow to the dishwasher.
Inspect the water hoses for any signs of damage or blockages. If necessary, replace the water inlet hose with a new one to ensure proper water supply.
10. Clean the dishwasher spray arms
Clogged or blocked spray arms can prevent water from being distributed evenly inside the dishwasher, leading to a lack of water during the wash cycle.
Remove the spray arms from the dishwasher and clean them thoroughly, ensuring all the spray holes are clear of debris or buildup. Reinstall the spray arms properly after cleaning.
11. Run a Dishwasher Cleaning Cycle
Over time, mineral deposits, grease, and detergent residue can accumulate in the dishwasher, affecting its performance.
Run a dishwasher cleaning cycle using a commercial dishwasher cleaner or a vinegar and baking soda solution to eliminate buildup and enhance water flow.