02 6294 4443
Air Turners Logo

Complete Fujitsu Air Conditioner Error Code Guide [2026]

Decode the flashing lights and error codes on your Fujitsu split system or ducted unit.

Diagnostic Summary

Updated for 2026: If your Fujitsu air conditioner is flashing red or green lights, or displaying an "E" code on the wall controller, it has entered "Lockout Mode" to protect itself from damage. The most common Fujitsu fault is the "Operation and Timer" flash pattern, which indicates specific sensor or PCB failures. Before calling a technician, perform a "Hard Reset" by turning the system off at the outdoor isolator switch for 20 minutes.

Step 1: The "Hard Reset" (Try This First)

Most "glitch" errors can be cleared with a full power cycle. Do not skip this step.

  1. Locate the Isolator: Go to your outdoor unit and find the switch labeled "Air Con" or "Isolator" (usually a large white switch).
  2. Power Down: Turn this switch to the OFF position.
  3. Wait: Leave it off for at least 20 to 30 minutes. This drains the capacitors in the onboard computer (PCB).
  4. Power Up: Turn the switch back on and try to run the unit on "Cooling" mode (set to 24°C).
Result: If the lights start flashing again immediately, you have a hard fault. Proceed to the Error Code tables below.

Step 2: Decode the Flashing Lights (Split Systems)

For wall-mounted units without a wired controller. Count the flashes on the "Operation" (Red/Green) and "Timer" (Green/Orange) lights.

Operation (Red) Timer (Green) Likely Issue Action
2 Flashes 2 Flashes Indoor Air Sensor Error Call Pro
2 Flashes 3 Flashes Indoor Pipe Sensor Error Call Pro
3 Flashes 2 Flashes Discharge Temp (Overheating) Call Pro
5 Flashes 3 Flashes Drain Pump Error Check Drain
5 Flashes 5 Flashes Compressor Failure URGENT
5 Flashes 6 Flashes Outdoor Fan Error Check Fan
6 Flashes 2 Flashes Outdoor Main PCB Error Call Pro
6 Flashes 3 Flashes Inverter Error Call Pro
9 Flashes 4 Flashes Current Overload / Trip Call Pro
Continuous Any Manual Auto Switch Stuck Check Unit

Step 3: Wired Controller Codes (Ducted Systems)

If you have a wall controller, an alphanumeric code (E:XX) will appear on the screen.

Error Code Description Meaning / Action
E:EE General Comms Error Hold "Temp Up" + "Temp Down" buttons for 3 secs to see code.
E:01 Comms Error Units aren't "talking". Cable or PCB fault.
E:02 Room Sensor Open Sensor in wall controller is faulty.
E:04 Indoor Heat Exch Sensor Indoor coil sensor failure.
E:08 Power Source Error Unstable voltage or loose connection.
E:09 Float Switch Operated Common: Safety tray full of water. Drain is blocked.
E:11 Serial Comms Error Major communication failure between boards.
E:12 Indoor Fan Failure Internal fan motor has seized or failed.
E:1A Compressor Failure The heart of the system has stopped.
E:A1 Discharge Temp Error System running too hot (Low gas or dirty coils).

Diagnostic Flowchart: Can I Fix It Myself?

Scenario A: Leaking Water

Code: 5 Flashes (Timer) or E:09

DIY Fix: Check the drain outlet outside. Is it blocked by dirt/garden mulch? Use a wet-vac to clear it.

If it persists, the internal pump is dead. Call Us.

Scenario B: "Filter" Light

Code: Flashing Filter Light (No E Code)

DIY Fix: This is a reminder, not a fault. Wash filters in warm water, dry them, and press "Filter Reset" on controller.

Scenario C: Blowing Warm

Code: E:A1 or Discharge Temp

DIY Fix: Check outdoor unit. Is the back covered in dust/leaves? Wash gently with hose.

Still failing? Likely gas leak.

Code Returned? You Need a Professional.

Modern Fujitsu systems are complex computers. Attempting to replace sensors or PCBs yourself can void your warranty and is dangerous. We carry official Fujitsu diagnostic tools and genuine parts.

Call for Diagnosis: 02 6294 4443 Book Online

Need Help Fast?

Our Canberra technicians are authorized Fujitsu repair agents.

  • Diagnostic Tools
  • Genuine Parts
  • Warranty Repairs
Call 02 6294 4443

Related Information

→ Fujitsu Installation & Sales → General AC Repairs → Warranty Information