Bosch f43 error will not clear

This thread was marked as solved. Here's a summary of the problem and the fix, generated from the discussion below.

Bosch Logixx 8 WAS28760GB/14 showing F43 after carbon brush replacement

The problem

Bosch Logixx 8 Sensitive WAS28760GB/14 displayed F43. The motor brushes had been found worn down and were replaced, but the fault code remained and would not clear despite trying online reset instructions for a different control layout.

Likely cause

The accepted reply says this model would not normally need a manual reset if the underlying fault had been corrected. The remaining F43 therefore points to the original repair not yet resolving the fault, most likely due to the new brushes not making proper contact, not being fully released/fitted correctly, or a poor connection at the motor plug. It was also noted that if the old brush contact faces were still shiny, the brushes may not have been the true cause.

What fixed it

Recheck the brush installation rather than relying on a reset procedure. Confirm the new brushes are fitted correctly, released if supplied retained in place, and making good contact with the commutator. Inspect the motor plug and internal terminals for poor contact or any connector pushed back. The thread was marked solved, but no final confirmation of the exact repair was posted.

Checks to try

• Tried online reset sequence but fault remained
• Checked condition of old brushes, including whether the contact faces were shiny or black/charred/sooty
• Recheck that the new brushes are fitted properly and making good contact on the commutator
• Check whether replacement brushes need releasing after fitting
• Inspect motor connections in the motor plug
• Check for connectors pushed back inside the motor plugs

Parts or tools mentioned

• Motor brushes