ABB Error 111806 — Computer WDU fault
ErrorABB 111806 (“Computer WDU fault”): Write/read fault in the internal RAM of the WDU logic board. Likely part: Calculateur WDU (computer WDU).
Updated 2026-10-22 · LogrobotLM reference
What it means
Write/read fault in the internal RAM of the WDU logic board.
What to check
- Switch the controller off and back on.
- Replace the logic board if the fault persists.
- Note: Equivalent to the RWM RAM faults (510-2) on S2/S3 or 32301 on S4.
Part to check / replace
ABB 111806 points to the hardware below — start here before ordering.
Tap a part for every code that points to it — and verify the exact variant for your controller before ordering.
Related codes
Indicative field information — the robot manufacturer's manual and safety procedures always prevail. Never bypass a safety device; apply lockout/tagout (LOTO) before any physical intervention. How this reference is built →