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FANUC Alarm PNT1-656 — Min. output has flow > setpoint

Manufacturer wording — %sMin. output has flow > setpoint
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC PNT1-656 (“Min. output has flow > setpoint”): With a minimum control output, the flow rate was measured to be higher than the setpoint (requested flow). First check: Check and perform the following:

Updated 2026-09-17 · LogrobotLM reference

Description

With a minimum control output, the flow rate was measured to be higher than the setpoint (requested flow). The Max. control out (ms) parameter affects the sensitivity of this alarm. This might be caused by a leaking or broken air line between the flow sensor and the applicator. The I/P transducer might be stuck open. The air booster might be stuck open or might be leaking. This might be caused by a faulty air flow sensor (reading more flow than there really is). Note: AccuAir temporarily and automatically changes to Open Loop when this alarm occurs.

Remedy

Check and perform the following:

Related codes

PNT1-654Lower output did not lower flowPNT1-655Time out during a cal. testPNT1-657Max. output has flow < setpointPNT1-658Flow setpoint below globals

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 →