Overview

This document provides a detailed list of error codes and diagnostic references for earlier Fujitsu General models.
It supports field technicians in identifying, interpreting, and troubleshooting system faults across a broad range of split, ducted, cassette, and VRF models.

Key Features

  • Error Code Reference Table:
    Includes fault indicators for both indoor and outdoor units, with LED signal interpretation.

  • Thermistor Resistance Values:
    Detailed resistance and voltage correlation tables for room, indoor heat exchanger, and outdoor thermistors — essential for confirming sensor accuracy.

  • Model Index:
    Covers a wide array of product families (e.g., ASTG, AOTG, ARTA, AOTA, AUT, ABT, etc.), organized for quick lookup.

  • LED Indicators:
    Describes meaning of outdoor and indoor unit LED patterns, aiding in rapid field diagnosis without digital tools.

Usage Guidelines

  1. Identify the error code or LED pattern displayed on the indoor or outdoor PCB.

  2. Cross-reference the code in the relevant model section.

  3. Use the thermistor and sensor tables to confirm related circuit values.

  4. Apply standard safety procedures before conducting electrical or resistance tests.

  5. Always verify wiring integrity and sensor condition before replacing electronic components.