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16 Flashes (Outdoor Unit)

Outdoor Unit LED 16 Flashes — Fan motor 1 error (permanent stoppage)

Fujitsu · Air to Water Heat Pumps

What does 16 Flashes (Outdoor Unit) mean?

The LED on the outdoor unit flashes 16 times. This indicates a critical and persistent error with outdoor fan motor 1, leading to a permanent system stoppage.

Common Causes

  • Faulty outdoor fan 1 motor.
  • Obstruction preventing the fan blades from rotating freely.
  • Loose or damaged wiring to the fan motor.
  • Failure of the fan's control circuit on the PCB.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the heat pump system at the main breaker, wait one minute, then restore power.

  2. 2

    Visually inspect outdoor fan 1 for any physical obstructions (leaves, debris) that might be jamming the blades and carefully remove them (with power off).

  3. 3

    Gently try to spin the fan blades by hand (with power off) to see if they move freely.

  4. 4

    If the fan motor appears faulty or does not operate after clearing obstructions, contact a qualified technician for inspection and replacement.

Browse all codes in this manual (59)
Verified technical data. Last updated: April 2026

Related Faults

1 Flash (Outdoor Unit)Outdoor Unit LED 1 Flash — Serial forward transfer error10Fault 10 — Outdoor sensor error11Error 11 (1 Green, 1 Red Flash) — Communication error between Hydraulic and Outdoor unit
Source: Fujitsu Air to Water Heat Pumps
Open Manual (Page 9)Search more codes in this manual