KUKA Error 2172 — CHANNEL PROTOCOL EXPECTED
Displayed as KSS02172 on KRC4 / KRC5 controllers
KUKA 2172 (“CHANNEL PROTOCOL EXPECTED”): A channel protocol is expected. First check: Modify the program accordingly.
Updated 2026-09-09 · LogrobotLM reference
Cause
A channel protocol is expected.
Effect
The program cannot be executed.
Troubleshooting
Modify the program accordingly. 1
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 →