What Does Error Code E50 Mean on a Bosch Washing Machine?
Power off the machine at the wall, wait 5 minutes, then restart a spin cycle — this resets the motor driver and clears temporary faults in the majority of E50 cases (takes about 5 minutes).
Fault description
Error code E50 points to a fault in the motor system of your Bosch washing machine. The tachogenerator is a small sensor attached to the motor that monitors drum speed and feeds that information back to the control board. The motor driver is the electronic circuit responsible for delivering power to the motor in a controlled way. When either of these components fails or sends an unexpected signal, the machine raises the E50 error.
When this error occurs, you will typically notice the drum slowing down, failing to reach the correct spin speed, or stopping mid-cycle altogether. The machine may pause, display E50, and refuse to continue until the fault is resolved. In some cases the drum will not move at all from the start of the cycle.
The good news is that E50 is not always caused by a failed motor. Loose connections, a worn carbon brush set, or a temporary control board glitch can all trigger the same code, and several of these are straightforward to check yourself before calling anyone out.
Causes
- Temporary motor driver glitch — A brief power fluctuation or software hiccup in the control board can cause the motor driver to report a fault incorrectly. A full power reset often clears this without any physical repair needed.
- Worn or damaged carbon brushes — Carbon brushes transfer electrical current to the motor's rotating armature. As they wear down over years of use, contact becomes intermittent, causing the motor to stall or run erratically and triggering the E50 code.
- Faulty or disconnected tachogenerator — The tachogenerator sits on the back of the motor and measures drum rotation speed. If its wiring connector has worked loose, or the sensor itself has failed, the control board receives no speed signal and shuts the motor down.
- Wiring harness fault between motor and control board — The cables running from the motor to the main PCB can chafe, corrode, or develop a broken wire over time. A damaged harness interrupts the signal and power supply to the motor, producing the same E50 error.
- Failed motor driver module or main PCB — If the motor driver circuitry on the main control board has burned out or a component has failed, the board cannot regulate motor power correctly. This is less common but will require board repair or replacement.
- Seized or mechanically overloaded motor — A foreign object lodged between the drum and the tub, or a failed drum bearing putting excessive load on the motor, can cause the motor to stall repeatedly until the E50 fault is logged.
Step-by-Step Fix
- 1
Perform a full power reset
Switch the machine off at the wall socket and unplug it completely. Leave it unpowered for at least 5 minutes to allow the motor driver capacitors to discharge and the control board to reset. Plug back in, select a spin-only cycle, and observe whether the drum starts and runs normally.
- 2
Check the drum for obstructions
Before opening any panels, try turning the drum by hand through the door. It should rotate smoothly with only light resistance. If it feels stiff, grinds, or will not turn at all, something may be jammed between the drum and the tub — a coin, underwire, or similar object. Remove any obstruction you can reach through the door seal.
- 3
Inspect the motor wiring connectors
Unplug the machine and remove the rear panel (usually held by two or three screws along the top edge). Locate the motor at the bottom of the machine and check that all wiring connectors are firmly seated. Press each connector in until it clicks. Look for any wires that appear burned, corroded, or have pulled out of their terminals.
- 4
Check the tachogenerator connection
The tachogenerator is a small plastic sensor clipped to the rear of the motor body, usually with a two-wire connector. Disconnect and firmly reconnect this connector. Inspect the wires for damage. If you have a multimeter, the tachogenerator coil should show a resistance of roughly 100–200 ohms across its two terminals — a reading of zero or infinite resistance indicates a failed sensor.
- 5
Inspect and replace the carbon brushes
Carbon brushes are located on either side of the motor body and are held in place by small plastic or metal holders that unclip or unscrew. Slide each brush out and measure its length — brushes worn down to less than 5 mm (roughly the length of a fingernail) need replacing. New brushes are inexpensive and model-specific; fit them as a pair and ensure they slide freely in their holders before reassembling.
- 6
Run a test cycle and monitor
Reassemble the rear panel, plug the machine back in, and run a full wash cycle while staying nearby. Listen for any unusual grinding, humming, or stuttering from the motor area. If the cycle completes without the E50 code returning, the fault is resolved. If the error reappears, note exactly which part of the cycle triggers it, as this information will help a service technician diagnose the fault faster.
- 7
Test or replace the motor
If all the above checks pass but E50 persists, the motor itself or the motor driver on the main PCB is likely at fault. Replacing a washing machine motor is within the capability of a confident DIYer, but testing the motor driver circuit requires electronic diagnostic equipment. At this point it is reasonable to call a service technician unless you are comfortable with appliance electronics.
Affected models
Select your model to see its full troubleshooting page.
When to call a service technician
Contact a service technician if the drum will not turn at all by hand, which suggests a seized bearing or a mechanically failed motor that needs specialist tools to replace safely. You should also call a technician if you have replaced the carbon brushes and confirmed the tachogenerator and wiring are sound, but the E50 code continues to appear — this pattern strongly points to a failed motor driver circuit on the main PCB, which requires electronic diagnosis and board-level repair or replacement.
Additionally, if you notice a burning smell, scorch marks near the motor or control board, or the machine trips your household circuit breaker when it tries to spin, stop using the appliance immediately and arrange a professional inspection before running it again.
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Frequently Asked Questions
Can I still use my Bosch washing machine while it shows E50?
It is not advisable to keep running the machine with an active E50 fault. If the motor is struggling or stalling, continuing to use it can cause further damage to the motor windings, carbon brushes, or control board. Resolve the fault first, then resume normal use.
How long do carbon brushes last on a Bosch washing machine?
Carbon brushes typically last between 5 and 10 years depending on how frequently the machine is used and how heavy the loads are. Machines running daily on high-spin cycles will wear brushes faster than those used a few times a week. Inspecting them every 4–5 years is a sensible precaution.
Is E50 the same as an E5 error on Bosch machines?
Not exactly. Some older Bosch models display a shortened version of error codes, so E5 and E50 can refer to the same motor fault category depending on the display type. Check your model's manual to confirm, but the diagnosis and repair steps are generally the same.
How much does it cost to fix a Bosch washing machine E50 error?
If the fix is a power reset or a new set of carbon brushes, costs are minimal — brushes typically cost £10–£20. A replacement tachogenerator is usually £15–£40. A new motor or main PCB, including labour from a service technician, can range from £150 to £300 or more depending on the model and your location.
Why does E50 keep coming back after I reset the machine?
A recurring E50 after a reset means the underlying hardware fault has not been addressed. The most common culprits for a persistent error are worn carbon brushes making intermittent contact, a failing tachogenerator, or a deteriorating motor driver circuit on the PCB. Work through the step-by-step checks above to identify which component is at fault.