KUKA Error 1373 — PROCESS BUSY
ErrorDisplayed as KSS01373 on KRC4 / KRC5 controllers
KUKA 1373 (“PROCESS BUSY”): Program already selected. First check: The selected program must be deselected.
Updated 2026-09-09 · LogrobotLM reference
Cause
Program already selected. The check takes place during command and program processing.
Effect
During command processing: The command is not executed. During program processing: Stop via braking ramp. All active commands inhibited.
Troubleshooting
The selected program must be deselected. In program processing, acknowledge the message.
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 →