Bosch Washing Machine Error Code E43 — Motor Rotation Failure
What this means
Error E43 means the control board is sending power to the motor but the drum is not rotating. This can be caused by a faulty tachometer (speed sensor) on the motor, a broken drive belt, a seized bearing, or a defective control board. Unlike E42, this specifically means no rotation is detected rather than an electrical fault.
Step-by-step fix
4 stepsCheck the drive belt
Remove the rear panel and check if the belt is intact and on the pulley. A broken belt means no drum rotation.
Spin the drum by hand
Try rotating the drum manually. If it won't turn, the bearings may be seized.
A grinding noise when turning indicates bearing failure.
Test the tachometer
The tachometer (speed sensor) is mounted on the motor. Test it with a multimeter — it should show resistance around 100–200 ohms.
Inspect the control board
If the belt, bearings, and tachometer are all fine, the motor control portion of the main board may have failed.
When to call a professional
Bearing replacement and control board diagnosis require professional expertise.
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
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