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Bosch Washer overflowing

When your Bosch washer is overflowing, shut off the power while it is filling. If water continues entering the tub, the water inlet valve is defective and should be replaced. A leaking detergent dispenser can also cause a washer to overflow when its valve continues dripping or flowing water into the dispenser. Next, inspect the main control board for a short or burned component that may keep sending power to the water inlet valve. Low household water pressure can prevent the valve from closing fully, especially if a whole-house filter is clogged. The pressure switch is another likely cause because it should stop the fill cycle when the proper water level is reached. Check its pressure hose for debris, kinks, or leaks before replacing the switch. Less commonly, the washing machine control board or its built-in pressure sensor may allow excessive water into the tub. These checks can help diagnose a Bosch washer overflowing or a washer overfilling with water. Enter your model number to find the exact replacement water inlet valve, dispenser, pressure switch, pressure hose, main control board, or control board for your specific washing machine.

01 - Bosch Washing Machine Detergent Dispenser

Since most detergent dispensers use a water valve to flush the detergent or other additives into the washer, a leaking dispenser water valve can cause the washer to overflow. If water is constantly dripping or flowing into the dispenser and the water valves are part of the detergent dispenser the dispenser will need to be replaced.
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02 - Bosch Washing Machine Water Inlet Valve

Try shutting off power to the washer while the machine is filling with water. If the washer continues to fill with water even when it is not getting power, this indicates that the water inlet valve is defective. If the water inlet valve is defective, replace it.
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03 - Bosch Washing Machine Main Control Board

A dishwasher's main control board provides power to nearly every electrical component in the dishwasher. If the control board continues to send power to the water inlet valve during the drain cycle, the dishwasher could overflow. While this is not that common of a problem, you can inspect the board for signs of burning or a shorted-out component. You can also use a multimeter to test the water inlet valve for incoming power during the dishwasher's cycle.
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04 - Low Water Pressure from House Supply

The water inlet valve requires good water pressure to shut off properly. If the home's water pressure is too low, the valve may not close fully after the power is shut off. As a result, water can leak into the washer and cause it to overflow. If you have a whole house filter it may be clogged and the filter needs to be replaced. If the water pressure is low at all the faucets, you may need to call your local water supplier to determine if the water pressure is sufficient.
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05 - Bosch Washing Machine Pressure Switch

The pressure switch shuts off power to the water inlet valve when the proper water level is reached. If the pressure switch fails, the water inlet valve will continue to fill the washer tub with water, causing the washer to overflow. Before replacing the pressure switch, check the air tube to the pressure switch to ensure that it is clear of debris and is not leaking.
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Highly Likely

06 - Bosch Washing Machine Control Board

Since a washing machine control board provides voltage to nearly all of the washer's electrical components, a board with a shorted component may send continuous voltage to the water inlet valve, causing the washer to overflow. You can inspect the board for signs of burning or a shorted-out component and use a multimeter to test the power output terminals on the board after reviewing the appliance's wiring diagram. Some washing machine control boards will have a built-in pressure sensor used to determine how much water to allow into the tub. The control board pressure sensor monitors the amount of water entering the tub dur...ing the fill cycle and will shut off voltage to the water inlet valve when the water has reached the proper level. A defective control board pressure sensor may allow too much water to fill the tub resulting in the washer overflowing. You can use a multimeter to test for appropriate changes in electrical continuity to help determine if the component is defective. If t
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Common

07 - Bosch Washing Machine Boot Seal Retaining Ring

The boot seal retaining ring is the component used to secure the door boot seal on front-load washing machines. If the retaining ring is broken or missing, the boot seal can become dislodged and allow water to overflow and leak out through the door during operation. Inspect the boot seal retaining ring for damage and replace if necessary.
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Uncommon But Possible

Frequently Asked Questions

Why is my Bosch washer overflowing?
Why does my Bosch washer keep filling with water when it is off?
Can low water pressure cause a Bosch washer to overflow?
How do I test the pressure switch on a Bosch washer that is overfilling?
How do I find the correct Bosch washer water inlet valve or dispenser part?