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Air Sensor Open (AUY, ABY & AWY)

Red 2 Pulses, Green Blinks, Yellow Off (AUY, ABY & AWY) — Air Sensor Open Circuit

Fujitsu · Air Conditioners

What does Air Sensor Open (AUY, ABY & AWY) mean?

The red LED shows 2 pulses, the green LED blinks, and the yellow LED is off. This indicates an open circuit condition in the air temperature sensor, meaning the sensor is not connected or faulty.

Common Causes

  • Disconnected sensor wire.
  • Broken sensor wire or component.
  • Faulty air sensor.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the air conditioner at its power source.

  2. 2

    Inspect the air sensor's wiring for any disconnections or physical damage.

  3. 3

    Restore power and observe if the error clears.

  4. 4

    If the issue persists, a service technician will be needed to replace the sensor or repair the wiring.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

AFM Filter Error (AUY, ABY & AWY)Red Blinks, Green 12 Pulses, Yellow Off (AUY, ABY & AWY) — Active Filter Module ErrorAir Sensor Closed (AUY, ABY & AWY)Red 2 Pulses, Green Blinks, Yellow Blinks (AUY, ABY & AWY) — Air Sensor Closed Circuit (Short)CT Error (AUY, ABY & AWY)Red Blinks, Green 11 Pulses, Yellow Off (AUY, ABY & AWY) — CT Error (Current Transformer)
Source: Fujitsu Air Conditioners
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