FANUC Alarm PAIN-550 — WARN …0 air flow rate timeout
Manufacturer wording — WARN %s0 air flow rate timeout
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC PAIN-550 (“WARN …0 air flow rate timeout”): All of the conditions were set for air to be flowing and a zero flow rate was measured for longer than the Zero flow timeout parameter. First check: Check, clean and possibly replace the air cap. Likely part: Air flow sensor (Air flow sensor) +1 more.
Updated 2026-09-17 · LogrobotLM reference
Description
All of the conditions were set for air to be flowing and a zero flow rate was measured for longer than the Zero flow timeout parameter. This may be caused by: a clogged air cap, a broken applicator trigger, broken air lines, a loss of air supply pressure, a broken air flow sensor, a broken cable (to the flow sensor), or a Zero flow timeout value that is too short. Note, AccuAir temporarily automatically changes to Open Loop when this alarm occurs.
Remedy
Check, clean and possibly replace the air cap. Check that the gun is properly triggering. If air was observed to be flowing, check and possibly replace the air flow sensor. Check for a broken air line. Possibly increase the Zero flow timeout parameter (by about 25%).
Part to check / replace
FANUC PAIN-550 points to the hardware below — start here before ordering.
Tap a part for every code that points to it — and verify the exact variant for your controller before ordering.
Related codes
Same hardware involved
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 →