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Error code reference

Bosch Washer Error Code F:29

No water filling detected by flow sensor (fast measurement)

Bosch codesBosch washer codes

No water filling detected by flow sensor (fast measurement) - water tap closed, filter/supply blocked, solenoid valve broken, aqua stop valve broken, or pressure sensor broken.

First step from the service manual

Open water tap, check components, check wire harness.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What F:29 means on a Bosch washer

The F:29 error code on a Bosch washer indicates that the flow sensor has failed to detect any water entering the machine during the fill cycle. The control board monitors incoming water flow using a flow meter (also called a flow sensor or turbine sensor), and when this sensor registers zero flow within a defined fast measurement window, the machine halts the cycle and displays F:29. This is a fill-side fault, meaning the washer is confirming that water is not moving through the inlet system at the rate or volume expected.

The most immediate and common cause is simply a closed or partially closed water supply tap. Beyond that, a clogged inlet filter screen at the back of the machine can restrict flow enough to trigger the fault. The solenoid valve that controls water entry into the drum may have failed electrically or mechanically, preventing the valve from opening. The Aqua Stop safety valve, located in the inlet hose assembly, can also close and lock out water flow if it has been triggered by a leak detection event or has failed internally.

The flow sensor itself can fail and report no flow even when water is actually present. The wire harness connecting the flow sensor, solenoid valve, or pressure sensor to the control board should also be inspected for loose connectors, corrosion, or damage. The pressure sensor is listed as a potential cause because some Bosch designs cross-reference pressure and flow readings to validate fill status. Diagnosis should begin with confirming the tap is fully open, then proceed to component-level checks in the order of accessibility.

Source: manufacturer service documentation.

Common causes of F:29

  1. 01

    Water supply tap closed or restricted

    Wiring / connection

    The tap behind the washer may be fully or partially closed, preventing any water from reaching the machine. Confirm the tap is turned fully open and the supply hose is not kinked.

  2. 02

    Clogged inlet filter screen

    Wiring / connection

    A mesh filter sits where the inlet hose connects to the back of the washer and can become blocked with sediment or debris over time. Unscrew the inlet hose from the valve port, remove the filter screen, and rinse it clean.

  3. 03

    Failed solenoid inlet valve

    Part replacement

    The solenoid valve opens electrically to let water into the drum, and if its coil has burned out or the valve body is stuck closed, no water will enter. Check for correct voltage at the valve terminals and continuity across the coil.

  4. 04

    Aqua Stop valve activation or failure

    Part replacement

    The Aqua Stop valve is a safety device built into the inlet hose that can shut off water flow if a leak is detected or if the device itself has failed. If the hose feels unusually stiff or the float inside has triggered, the entire Aqua Stop hose assembly will need replacement.

  5. 05

    Faulty flow sensor or pressure sensor

    Part replacement

    The flow sensor measures water moving through the inlet, and the pressure sensor monitors water level in the tub. Either sensor can fail and falsely report no fill even when the supply is functional. Inspect the wire harness connections to both sensors before replacing components.

See the test procedure for each cause

Frequently asked questions about F:29

What does F:29 mean on a Bosch washer?
F:29 means the washer's flow sensor detected no water entering the machine during the fast measurement phase of the fill cycle. The control board expects to see water movement within a set time window, and when flow is not confirmed, it stops the cycle and displays this fault. The cause can range from a closed water tap to a failed solenoid valve, Aqua Stop valve, or flow sensor. Checking the water supply and inlet filter is the recommended starting point.
How do I fix the F:29 error on my Bosch washer?
Start by confirming the water supply tap is fully open and the inlet hose is not kinked or blocked. Next, disconnect the inlet hose from the back of the washer and clean the small filter screen inside the valve port. If water supply and the filter are both fine, the solenoid inlet valve, Aqua Stop hose assembly, or flow sensor may need to be tested and replaced. Check all wire harness connections to these components before ordering parts.
Is it safe to continue using my Bosch washer when F:29 is displayed?
You should not attempt to run a wash cycle while F:29 is active. The machine has halted because it cannot confirm water is filling the drum, and running the motor without adequate water can damage internal components. Resolve the fill fault before resuming normal use.
How much does it cost to repair a Bosch washer F:29 error?
If the fix is simply opening a tap or cleaning the inlet filter, there is no parts cost. A replacement solenoid inlet valve typically costs between $30 and $80 for parts, while an Aqua Stop hose assembly can range from $25 to $70. If professional labor is involved, expect to add $80 to $150 or more depending on your location and the technician's rates.
Will resetting my Bosch washer clear the F:29 error?
A reset may temporarily clear the fault code from the display, but the error will return as soon as the machine attempts to fill again if the underlying problem has not been resolved. To permanently clear F:29, the root cause such as a blocked filter, closed tap, or failed component must be corrected first. After the repair, running a short cycle will confirm the fault has been resolved.

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