Bosch Washer Error Code 43

Error code 43 on a Bosch washer means the drum motor is not rotating and the control board cannot confirm movement through the speed sensor. The code can be triggered by a blocked drum, a broken speed sensor, a failed drive motor, or a faulty control board Triac. The washer halts the cycle automatically to prevent mechanical damage. Diagnosis involves testing each of these components along with the wire harness connecting them.

You should not attempt to run wash cycles while error 43 is active. The drum is not rotating, which means laundry will sit in water without being properly agitated or spun, potentially causing mold or garment damage. More importantly, an underlying motor or control board fault could worsen with repeated operation. Resolve the fault before resuming normal use.

Activating the test mode to reset the error is the recommended first diagnostic step, and in some cases, particularly when the drum was temporarily blocked by laundry, the reset will allow the washer to resume normal operation. However, if an underlying component such as the speed sensor, motor, or control board is genuinely faulty, the error code will return once the washer attempts another cycle. A reset alone should be considered a diagnostic step, not a permanent fix.

Some causes of error 43 are DIY-friendly, such as removing excess laundry, clearing a blocked drum, or checking for loose wire harness connections. However, replacing the speed sensor, drive motor, or control board requires working with electrical components and a degree of disassembly experience. If you are not comfortable testing components with a multimeter or accessing internal washer parts, it is advisable to contact a qualified appliance repair technician.

Repair costs vary significantly depending on which component has failed. Speed sensor replacements tend to be the least expensive, typically in the range of $50 to $150 including parts and labor. Drive motor replacements can range from $150 to $350 or more depending on the model. Control board replacement, which involves Triac failure, is usually the most costly repair, often falling between $200 and $450. A diagnostic service call fee will typically apply on top of parts and labor costs.