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Error code reference

Bosch Washer Error Code 26

Error of analogue pressure sensor

Bosch codesBosch washer codes

Error of analogue pressure sensor - provides error voltage; pressure sensor broken or hose to sensor blocked.

First step from the service manual

Reset error with OFF and ON, check pressure sensor, check hose to pressure sensor, 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 26 means on a Bosch washer

Error code 26 on a Bosch washer indicates a fault in the analog pressure sensor circuit. Specifically, the sensor is outputting a voltage signal that falls outside the acceptable range for normal operation. The pressure sensor, also called a water level sensor or pressostat, is responsible for monitoring the water level inside the drum by detecting air pressure changes in a small hose connected to the tub. When the control board receives a signal from this sensor that is out of specification, it registers error 26 and halts operation to prevent overfilling or incorrect cycle behavior.

The two primary hardware causes are a broken or failed pressure sensor and a blocked hose connecting the sensor to the tub. A faulty sensor may produce a constant erroneous voltage rather than the variable signal that corresponds to actual water levels. A kinked, clogged, or disconnected sensor hose will prevent accurate air pressure readings from reaching the sensor, which can also cause the sensor to output an error voltage. Debris, detergent buildup, or pinching from an improperly routed hose are common reasons for blockage.

The wiring harness between the pressure sensor and the main control board is also a suspect, particularly if connectors are corroded, loose, or if a wire has broken continuity. Before replacing components, a full reset by powering the machine off and back on should be performed first, as transient voltage spikes can occasionally trigger this code. If the error returns after a reset, systematic inspection of the sensor, hose, and wiring is required to isolate the fault.

Source: manufacturer service documentation.

Common causes of 26

  1. 01

    Blocked or kinked pressure sensor hose

    Wiring / connection

    The small rubber or plastic hose running from the tub to the pressure sensor can become kinked, pinched, or clogged with debris and detergent residue. Inspect the full length of the hose for bends, blockages, or disconnections, and clear or reposition as needed.

  2. 02

    Failed analog pressure sensor

    Part replacement

    The pressure sensor itself may be producing a voltage output that is outside the normal operating range, indicating internal component failure. If the hose is clear and the wiring checks out, the sensor will need to be replaced.

  3. 03

    Loose or corroded wiring harness connection

    Wiring / connection

    The connector or wiring harness between the pressure sensor and the main control board may have a loose pin, corroded terminal, or broken wire, causing an abnormal signal to reach the board. Inspect connectors for corrosion and check wiring continuity.

  4. 04

    Transient voltage spike or control board glitch

    Wiring / connection

    Occasional electrical fluctuations can cause the control board to misread the sensor signal and trigger error 26 without a true hardware fault. Performing a full power reset by turning the machine off and back on can clear this type of false positive.

  5. 05

    Disconnected pressure sensor hose

    Wiring / connection

    The hose connecting the tub to the pressure sensor may have slipped off one of its connection points, eliminating the air pressure signal entirely. Check both ends of the hose at the tub fitting and the sensor port to confirm secure attachment.

See the test procedure for each cause

Frequently asked questions about 26

What does 26 mean on a Bosch washer?
Error code 26 on a Bosch washer indicates a fault with the analog pressure sensor, which monitors the water level inside the drum. The sensor is producing a voltage that is out of the expected range, which the control board interprets as a sensor error. This can be caused by a broken sensor, a blocked or disconnected hose leading to the sensor, or a wiring fault. The washer will not operate normally until the issue is resolved.
Can I fix error code 26 on my Bosch washer myself?
Yes, some causes of error 26 are accessible for DIY repair. Start by resetting the machine using the power button, then inspect the pressure sensor hose for kinks, blockages, or loose connections. If the hose is clear, check the wiring harness connectors at the pressure sensor for corrosion or loose pins. Replacing the pressure sensor itself is a moderately involved repair but is manageable for someone comfortable working inside appliances.
Will resetting my Bosch washer clear error code 26?
A power reset, turning the machine off and then back on, can clear error 26 if the code was triggered by a temporary electrical glitch rather than a true hardware failure. If the error returns after the reset, the underlying cause such as a blocked hose or faulty sensor must be addressed. A reset alone will not fix a physically damaged sensor or a clogged hose.
Is it safe to continue using my Bosch washer when error code 26 is showing?
No, it is not advisable to continue running the washer while error code 26 is active. Because the pressure sensor controls water level detection, a faulty or unresponsive sensor could lead to the machine overfilling with water. It is best to resolve the fault before running additional cycles to avoid potential water damage.
How much does it cost to repair error code 26 on a Bosch washer?
If the repair only requires clearing a blocked hose or reseating a connector, there may be no parts cost at all. If the pressure sensor itself needs to be replaced, parts typically range from $20 to $60 depending on the model, with professional labor adding $80 to $150 or more depending on your location. Getting the hose and wiring checked first can help avoid unnecessary parts replacement.

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