Error code reference

Bosch Dishwasher Error Code #E

Apexx display

Bosch codesBosch dishwasher codes

Apexx display: Water switch fault (no pulses detected).

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Get the full diagnostic procedure for #E.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What #E means on a Bosch dishwasher

Error code E on Bosch Apexx-display dishwashers indicates a water switch fault, specifically that the control board is receiving no pulses from the water switch (also called a flow meter or turbine sensor). The control board monitors water intake by counting electrical pulses generated as water flows through the switch. When zero pulses are detected during a fill cycle, the board logs this code and halts operation to prevent running components dry or overfilling.

For homeowners, this error means your dishwasher started a cycle but could not confirm that water was entering the machine. The water switch is a small sensor in the water inlet path that spins as water flows past it and sends signals back to the control board. If the board gets no signal at all, it does not know whether water is present, so it shuts down rather than risk damage.

This fault can stem from a failed water switch, a wiring break between the switch and the control board, a blocked or seized switch turbine that cannot spin, or in some cases a control board that has lost the ability to read the signal. Because no pulses are detected rather than incorrect pulses, a complete signal loss such as a broken wire or dead sensor is more likely than a calibration issue.

Source: manufacturer service documentation.

Common causes of #E

  1. 01

    Failed water switch (flow meter)

    Part replacement

    The water switch itself has failed mechanically or electrically and produces no output signal regardless of water flow. This is the most direct cause of a zero-pulse reading and the most common hardware failure for this code.

  2. 02

    Broken or disconnected wiring harness to water switch

    Wiring / connection

    A break, corrosion, or loose connector in the wiring between the water switch and the control board interrupts the pulse signal before it reaches the board. The switch may be functioning correctly, but the control board receives nothing.

  3. 03

    Blocked or seized water switch turbine

    Wiring / connection

    Mineral scale, debris, or a foreign object can jam the small spinning turbine inside the water switch so it cannot rotate during fill. A seized turbine generates no pulses even if the switch electronics are intact.

  4. 04

    Faulty control board

    Part replacement

    If the water switch, wiring, and turbine all check out correctly, the control board's input circuit for the water switch signal may have failed, causing it to read zero pulses even when the signal is present.

See the test procedure for each cause

Frequently asked questions about #E

What does error code E mean on a Bosch Apexx dishwasher?
Error code E on Bosch Apexx-display dishwashers signals a water switch fault where the control board detected no pulses from the water switch during a fill cycle. The water switch is a flow-sensing component that generates electrical pulses as water moves through it. When the board counts zero pulses, it cannot confirm water is entering the tub and stops the cycle.
How do I fix error code E on my Bosch dishwasher?
Start by checking the wiring connector at the water switch for corrosion, looseness, or visible breaks. If the connector is secure, inspect the water switch turbine for mineral buildup or debris that could be jamming it; cleaning the turbine sometimes resolves the fault. If the wiring and turbine are clear, the water switch itself likely needs replacement. Replacing the switch is a moderate DIY repair requiring disconnection of the water inlet line, but if the fault persists after a new switch is installed, the control board's signal input circuit may have failed and professional diagnosis is advisable.
Can I still use my Bosch dishwasher with error code E active?
No, you should not run the dishwasher with this error active. Because the control board cannot confirm water is entering the machine, running a cycle risks operating the wash pump without adequate water, which can overheat and damage the pump motor. The dishwasher will typically halt the cycle automatically when this code appears, and the underlying fault needs to be resolved before resuming normal use.
How much does it cost to repair error code E on a Bosch dishwasher?
If the fix is a clogged or seized water switch turbine that can be cleaned, there is no parts cost and only your time. A replacement water switch part typically costs between $20 and $60 depending on the model. If a technician is needed, expect a service call fee of $75 to $150 plus parts and labor, bringing the total to roughly $150 to $250 for a water switch replacement. A control board replacement, if that is the root cause, is significantly more expensive, often $200 to $400 in parts alone.
Is error code E on a Bosch dishwasher a serious problem?
It is a fault that prevents the dishwasher from completing cycles safely, so it requires attention before the appliance can be used normally. The most common causes, a failed water switch or a wiring issue, are repairable without replacing major components and are not considered catastrophic failures. Diagnosing the root cause early also prevents secondary damage, such as a burned-out wash pump from running dry.

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