LogrobotLM

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 →

FANUC Alarm SRVO-233 — SERVO TP OFF in T1,T2/Door open

Error
Hardware
emergency stop and dual safety chains
Controllers
R-J3iB / R-30iA / R-30iB
FANUC class
SERVO
Hardware family
FANUC emergency stop, pendant and dual safety chain alarms

FANUC SRVO-233 (“SERVO TP OFF in T1,T2/Door open”): The teach pendant is disabled when the mode switch is in T1 or T2. First check: Set the TP Enable/Disable switch to ON, close the controller door, and press RESET.

Updated 2026-10-22 · LogrobotLM reference

Description

The teach pendant is disabled when the mode switch is in T1 or T2. Or, the controller door is opened. Or, there is a mis-wiring of a hardware connection.

Remedy

Set the TP Enable/Disable switch to ON, close the controller door, and press RESET. If the reset is not effective, correct the hardware connection.

Field diagnosis

Mode select switch in T1 or T2 with the teach pendant disabled, or the cabinet door open; a fault in either of these devices gives the same code.

What to check

  • Enable the teach pendant to work in manual mode (or switch to AUTO), close the door, reset.
  • If the code remains: teach pendant, teach pendant cable, mode select switch, in that order.
  • Note: On cabinets without a door switch, only the teach pendant is involved.

Related codes

SRVO-105SERVO Door open or E.StopSRVO-207SERVO TP switch abnormal or Door openSYST-043PAUSE TP disabled in T1/T2 modeSRVO-231SERVO Chain 2 (0v) abnormalSRVO-232SERVO NTED inputSRVO-234WARN Deadman switch released

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 →