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FANUC Alarm SYST-166 — WARN TP intermittent communication error

FANUC SYST-166 (“WARN TP intermittent communication error”): Intermittent errors happened during the communication with the teach pendant. First check: Check that the teach pendant cable is working properly. Likely part: Teach pendant (Teach pendant).

Updated 2026-08-29 · LogrobotLM reference

Description

Intermittent errors happened during the communication with the teach pendant.

Remedy · Remède

Check that the teach pendant cable is working properly. Replace the cable if necessary. Check to determine if there is any source of electrical noise. Check that the teach pendant is working properly and replace the teach pendant if necessary.

Part to check / replace · Pièce à contrôler / remplacer

FANUC SYST-166 points to the hardware below — start here before ordering. · SYST-166 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 FANUC alarm SYST-166 mean?
FANUC SYST-166 (“WARN TP intermittent communication error”): Intermittent errors happened during the communication with the teach pendant.
How do you troubleshoot FANUC alarm SYST-166?
Check that the teach pendant cable is working properly. Replace the cable if necessary. Check to determine if there is any source of electrical noise. Check that the teach pendant is working properly and replace the teach pendant if necessary.
Which part is involved in FANUC SYST-166?
SYST-166 points to Teach pendant (Teach pendant). Confirm the real cause against the robot backup before replacing a part.

Related codes / Codes liés

SYST-164WARN Teach Pendant communication errorSYST-165PAUSE TP intermittent communication errorSYST-168Robot(G:%d) is isolatedSYST-169WARN S/W Registration is temporary

Same hardware involved / Même matériel en cause

SRVO-002Teach pendantSRVO-003Teach pendantSRVO-372Teach pendantSRVO-373Teach pendant

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 →