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FANUC Alarm SPOT-173 — PAUSE Backup open fault …-gun 2

Manufacturer wording — PAUSE Backup open fault %s-gun 2
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC SPOT-173 (“PAUSE Backup open fault …-gun 2”): The BU Open Detect input was not received within the specified timeout period. First check: Verify the input is assigned correctly; verify the input is being made when the backup gun is opened; or if needed, increase the timeout value (in $spoteqsetup.$bu_op_to).

Updated 2026-09-17 · LogrobotLM reference

Description

The BU Open Detect input was not received within the specified timeout period.

Remedy

Verify the input is assigned correctly; verify the input is being made when the backup gun is opened; or if needed, increase the timeout value (in $spoteqsetup.$bu_op_to).

Related codes

SPOT-171PAUSE Gun open fault …-gun 2SPOT-172PAUSE Gun close fault …-gun 2SPOT-174PAUSE Backup close fault …-gun 2SPOT-190PAUSE Bad Pressure (EP=…)-gun 2

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 →