mypros+
Error code reference

Bosch Washer Error Code F:43

Drum motor does not rotate

Bosch codesBosch washer codes
Avg. service call
$285
National average. Trip fee plus diagnostic plus labor. Before parts.
MyPros+ 3-day pass
$9.95
Same diagnostic steps, on your phone. Start now.
You keep in your pocket
~$275
Even before you buy the part.
Skip the service call. Fix it yourself.
Full procedure unlocks instantly.
Get Started

What the F:43 error code actually means

Your Bosch washer is showing F:43 because the drum is not spinning as expected and the machine has stopped the cycle as a safety measure. This could be something as simple as a piece of clothing stuck between the drum and the door seal, or it could point to a faulty part like a sensor, motor, or circuit board component. A technician will need to diagnose which specific part is causing the problem before repairs can be made.

Diagnostic procedure

The full F:43 procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
Reset error by activating test mode, check load, check speed sensor, check control, check wire harness.
Unlock with pass
Unlock with pass
Unlock with pass
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
Unlock F:43 procedure $9.95

Or subscribe: $29/month for unlimited access to all codes plus Max AI diagnostics.

Most common causes of F:43

Ranked by how often they cause this code
  1. 1Drum blocked by laundry or foreign object
  2. 2Broken or disconnected speed sensor
  3. 3Damaged wiring harness
  4. 4Seized or failed drum motor
  5. 5Failed control board Triac

Most DIYers save hundreds by diagnosing before ordering parts.

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass

Questions people ask about F:43

What does F:43 mean on a Bosch washer?
F:43 means the control board has detected that the drum motor is not rotating. The fault is triggered when the speed sensor sends no rotation signal during a cycle, which can be caused by a blocked drum, a broken speed sensor, a seized motor, or a failed Triac on the control board. This is a remanent error, meaning it stays stored in memory and requires a test mode reset to clear.
Will resetting the washer clear the F:43 error?
Simply unplugging the washer will not clear F:43 because it is stored as a remanent error in the control board memory. The error must be reset by entering the washer's test mode. Even after resetting, the fault will return if the underlying cause, such as a blocked drum, faulty sensor, or failed component, has not been corrected.
How much does it cost to repair a Bosch washer F:43 error?
Repair costs vary depending on the faulty component. A speed sensor replacement is typically one of the less expensive repairs, while a drum motor or control board replacement will cost significantly more, potentially ranging from $150 to $450 or higher depending on parts and labor in your area. Getting a diagnostic assessment first will help identify which component is at fault before committing to a repair cost.
Can I fix F:43 on my Bosch washer myself?
Some causes of F:43 are DIY-friendly, particularly clearing a drum blockage or checking for loose wiring harness connections. However, diagnosing and replacing a speed sensor, motor, or control board Triac requires comfort with electrical testing and appliance disassembly. If you are not experienced with multimeter testing and working around appliance components, a qualified technician is the safer choice.
Is it safe to use my Bosch washer when F:43 is displayed?
No, you should not continue using the washer while F:43 is active. The machine has halted because the drum is not rotating as required, and running a cycle without resolving the fault could worsen the damage to the motor or control board. Address the cause of the error before resuming use.

Related Bosch washer error codes

All Bosch washer codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass