ABB Error 34251 — Rectifier / power supply three-phase fault
ErrorABB 34251 (“Rectifier / power supply three-phase fault”): Loss of a mains phase detected by the rectifier. Likely part: Redresseur / Alimentation triphasée (rectifier / power supply three-phase).
Updated 2026-10-22 · LogrobotLM reference
What it means
Loss of a mains phase detected by the rectifier.
What to check
- Measure the three phases upstream, check the main switch, mains filter, fuses, contactors, three-phase wiring and rectifier.
- Note: Physical power supply error; may subsequently cause DC link and drive faults.
Part to check / replace
ABB 34251 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
Same hardware involved
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 →