FANUC Alarm MOTN-157 — PM: Internal error
Manufacturer wording — PM: Internal error(%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC MOTN-157 (“PM: Internal error”): An internal error has occurred. First check: Press RESET.
Updated 2026-09-17 · LogrobotLM reference
Description
An internal error has occurred.
Remedy
Press RESET. If the error is not cleared, document the events that led to the error and contact your FANUC or FANUC Robotics technical representative.
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 →