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Operation 4 Times (No display)

Operation LED blinks 4 times — Power supply frequency error.

Fujitsu · 410A Multi-Zone Mini-Split Systems

What does Operation 4 Times (No display) mean?

The system cannot recognize the power supply frequency within 4 seconds of being powered on, leading to a permanent stop.

Common Causes

  • The controller PCB is defective.
  • An issue with the external power supply frequency.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Reset the power to the unit by turning it off at the circuit breaker, waiting 30 seconds, then turning it back on.

  2. 2

    Check your home's electrical panel for any tripped breakers related to the unit.

  3. 3

    If the error persists, it likely indicates a problem with the controller PCB, requiring professional service.

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

Related Faults

6 Times, 4 Times Continuous (64)6 Times, 4 Times Continuous (64) — Active Filter / PFC Circuit error6 Times, 5 Times Continuous (65)6 Times, 5 Times Continuous (65) — IPM error / Trip terminal L error7 Times, 1 Time Continuous (71)7 Times, 1 Time Continuous (71) — Discharge thermistor error
Source: Fujitsu 410A Multi-Zone Mini-Split Systems
Open Manual (Page 25)Search more codes in this manual