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LogrobotLM — AI fault diagnosis for ABB · KUKA · FANUC robots. It reads your robot backup in your browser (never uploaded) and pinpoints the fault. Try it free → · Le diagnostic IA qui lit la sauvegarde de votre robot, sans rien téléverser.

ABB Error 34255 — Rectifier / cooling fault

Error / Erreur

🇫🇷 Redresseur / Ventilation

ENTRAÎNEMENT : REDRESSEUR, DC-LINK, BLEEDER, ENERGY BANK (34xxx, 36xxx, 386xx S4C+)

ABB 34255 (“Rectifier / cooling fault”): Rectifier / cooling fault — ABB robot hardware event on the rectifier / cooling (IRC5). Likely part: Redresseur / Ventilation (rectifier / cooling).

Updated 2026-08-29 · LogrobotLM reference

What it means · Ce que ça veut dire

Rectifier / cooling fault — ABB robot hardware event on the rectifier / cooling (IRC5). Seen across controller generations. Severity: Critical. Field diagnosis below (French); your robot's own manual remains authoritative.

Température excessive du redresseur.

What to check · Que vérifier

  • Inspect the rectifier / cooling, its wiring and connections first.
  • Match this code against your robot's event-log timeline before swapping parts.
  • Follow the French field checks below — they are the tested sequence for this fault.
  • Contrôler ventilateurs, circulation d’air, température ambiante et couple/charge prolongée; nettoyer les dissipateurs et rechercher une surcharge thermique.
  • À savoir : Applicable aux architectures IRC5 possédant le module/redresseur concerné.

Part to check / replace · Pièce à contrôler / remplacer

ABB 34255 points to the hardware below — start here before ordering. · 34255 met en cause l'organe ci-dessous : commencez par là.

Tap a part for every code that points to it — and verify the exact variant for your controller before ordering. · Touchez une pièce pour tous les codes qui la citent ; vérifiez la variante exacte avant commande.

Frequently asked · Questions fréquentes

What does ABB error 34255 mean?
ABB 34255 (“Rectifier / cooling fault”): Rectifier / cooling fault — ABB robot hardware event on the rectifier / cooling (IRC5). Seen across controller generations. Severity: Critical. Field diagnosis below (French); your robot's own manual remains authoritative.
How do you troubleshoot ABB error 34255?
Inspect the rectifier / cooling, its wiring and connections first. Match this code against your robot's event-log timeline before swapping parts. Follow the French field checks below — they are the tested sequence for this fault.
Which part is involved in ABB 34255?
34255 points to Redresseur / Ventilation (rectifier / cooling). Confirm the real cause against the robot backup before replacing a part.

Related codes / Codes liés

34100Drive system fault34200Axis Computer / Drive Units fault34201Drive Unit fault

Same hardware involved / Même matériel en cause

34256Redresseur / Ventilation

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. · Informations indicatives issues du terrain — le manuel du constructeur et ses procédures de sécurité font foi. Ne shuntez jamais un organe de sécurité ; consignez (LOTO) avant toute intervention physique. How this reference is built →