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Red 4 Flashes, Green 4 Flashes

Red 4 Flashes, Green 4 Flashes (Single System) — Power Failure

Fujitsu · Air Conditioners

What does Red 4 Flashes, Green 4 Flashes mean?

Both the red and green LED lights on the indoor unit flash four times simultaneously. This indicates a power supply issue to the unit.

Common Causes

  • Intermittent power loss or sag.
  • Loose power connection.
  • Problem with the main power supply or circuit breaker.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check your home's circuit breaker panel to ensure the air conditioner's breaker is not tripped.

  2. 2

    Verify that the power cord (if applicable) is securely plugged into the outlet.

  3. 3

    If there was a recent power outage, the unit may simply need a few minutes to reset.

  4. 4

    If the breaker keeps tripping or there's no power, consult an electrician.

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