CodeRegistry
Brands
  1. Home
  2. Fujitsu
  3. Air to Water Heat Pumps
  4. 24 Flashes (Outdoor Unit)
About·Privacy·Terms

CodeRegistry — Your global library for technical solutions.

For your safety: always follow the equipment manufacturer’s official manuals. CodeRegistry is an independent help site and is not affiliated with the brands listed here.

24 Flashes (Outdoor Unit)

Outdoor Unit LED 24 Flashes — Suction pressure sensor error

Fujitsu · Air to Water Heat Pumps

What does 24 Flashes (Outdoor Unit) mean?

The LED on the outdoor unit flashes 24 times. This indicates a problem with the suction pressure sensor, which measures the pressure of the refrigerant returning to the compressor.

Common Causes

  • Faulty suction pressure sensor.
  • Loose or damaged wiring to the sensor.
  • Abnormal refrigerant pressure affecting sensor reading.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Perform a full power reset of the heat pump system by turning off the main breaker for 60 seconds and then turning it back on.

  2. 2

    Ensure the outdoor unit is clear of any obstructions that might impact its operation.

  3. 3

    If the error persists, contact a qualified technician to diagnose or replace the suction pressure sensor.

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