How to Reset a Fujitsu Air Conditioner?

Date: 20-02-2026

When your Fujitsu air conditioner suddenly stops working, especially in the middle of an Australian summer, it’s stressful.

The green light might be flashing. The remote works but nothing happens. Maybe it turns on for a minute, then shuts off. Or there’s an error code you’ve never seen before.

Before you panic or book a $200 call-out, there’s something simple worth trying first.

In many cases, a proper reset will fix the issue.

This guide explains exactly how to reset a Fujitsu air conditioner safely, when it will work, and when it won’t.

 

When Should You Reset a Fujitsu Air Conditioner?

A reset is useful for temporary electronic glitches. Modern Fujitsu inverter systems have sensitive circuit boards. After a power outage, voltage spike, or storm, the unit can enter a protection mode.

A reset can help if:

  • The unit stopped working after a power outage
  • The operation light is flashing
  • The remote works but the unit does not respond
  • The system is stuck in one mode
  • The indoor unit beeps but doesn’t start
  • An error code appears briefly, then disappears

These are usually control board or communication glitches.

 

When You Should NOT Just Reset

A reset will not fix mechanical faults.

Do not rely on a reset if you notice:

  • A burning smell
  • Loud grinding or rattling from the outdoor unit
  • Water leaking heavily inside
  • The circuit breaker trips immediately every time
  • The unit repeatedly shuts down within seconds

Those symptoms usually indicate electrical or component failure and need professional inspection.

If in doubt, stop and seek advice.

 

How to Reset a Fujitsu Split System (Most Effective Method)

This is the proper reset process. Not just turning it off and on quickly.

Step-by-Step Power Isolation Reset

  1. Turn the air conditioner off using the remote.
  2. Switch the unit off at the wall isolator (usually near the outdoor unit).
  3. Turn off the circuit breaker at your switchboard.
  4. Wait at least 5 to 10 minutes.
  5. Turn the breaker back on.
  6. Turn the wall isolator back on.
  7. Restart the system with the remote.

Why You Must Wait

The wait time allows internal capacitors to fully discharge. If you restore power too quickly, the control board may not reset properly.

Many people skip the waiting step. That’s often why the reset doesn’t work.

 

Will This Erase My Settings?

No. It will not erase your programmed temperature or timer settings. It simply reboots the control board.

 

What If It Still Doesn’t Work?

If the unit does not power on after a full isolation reset:

  • Check the breaker hasn’t tripped again.
  • Make sure the wall isolator is fully switched on.
  • Replace the remote batteries.
  • Look for a flashing light pattern.

If the problem remains, move to the error code section below.

 

Resetting the Fujitsu Remote Control

Sometimes the issue is not the air conditioner — it’s the remote.

Remote Reset Method

  • Remove the batteries.
  • Press and hold the power button for 10 seconds.
  • Reinsert fresh batteries.
  • Point directly at the indoor unit and try again.

Some Fujitsu remotes have a small recessed reset button. If present, press it gently using a paperclip.

Common Remote Issues

  • Screen is blank
  • Buttons respond but unit does not
  • Display works but no signal is sent
  • Batteries replaced but still unresponsive

If the unit beeps when pressing buttons, the remote is likely working.

 

How to Reset a Fujitsu Ducted System

Ducted systems are slightly different.

For Ducted Systems:

  1. Turn the system off at the wall controller.
  2. Switch off the isolator (often located in the roof space or outside).
  3. Turn off the dedicated circuit breaker.
  4. Wait 10 minutes.
  5. Restore power in reverse order.

Ducted systems may take longer to reboot. Some will take a few minutes before airflow begins.

 

If the Controller Is Frozen

If the wall controller is stuck:

  • Isolate power completely.
  • Do not attempt to open the controller panel.
  • Restart after full shutdown.

Avoid touching roof isolators unless you are comfortable and safe doing so.

 

Fujitsu Error Codes: What They Mean

Many homeowners see a flashing light or a code and immediately assume the worst.

Here are common ones:

Error Indication

Likely Meaning

Will Reset Help?

Flashing green light

Communication fault

Often yes

E:01

Indoor/outdoor communication issue

Sometimes

A1

Indoor unit sensor fault

Rarely

E:EE

System malfunction memory

Sometimes

If the error disappears after reset and does not return, it was likely temporary.

If it returns immediately, it usually indicates a sensor, PCB, or compressor issue.

 

What to Do If Reset Does Not Fix the Problem

If your Fujitsu still won’t operate:

  1. Check your switchboard for tripped breakers.
  2. Inspect the outdoor unit for debris blocking airflow.
  3. Clean indoor filters.
  4. Make sure no timer or sleep mode is active.
  5. Listen for unusual noises.

If the breaker trips repeatedly, do not keep resetting it. That can cause damage.

 

Typical Service Costs in Australia (2026)

If you do need a technician, here’s what to expect:

  • Inspection call-out: $150–$250
  • Minor electrical or sensor fix: $300–$600
  • PCB replacement: $600–$1,200
  • Major component repair: $1,000+

If your air conditioner system is over 10–12 years old, replacement may be more cost-effective than major repairs.

 

Preventing Future Glitches

Most reset issues are caused by unstable power or lack of maintenance.

To reduce problems:

  • Clean filters every 3 months
  • Install surge protection if your area has frequent storms
  • Schedule annual servicing
  • Keep the outdoor unit clear of leaves and debris

Repeated power cycling can also stress the system. Avoid turning it off and on constantly.

 

Important Safety Notes

  • Never open the outdoor unit casing.
  • Never attempt refrigerant work yourself.
  • Only ARCtick licensed technicians can legally handle refrigerant in Australia.
  • Do not bypass safety switches.

Resetting power is safe. Internal repairs are not DIY.

 

Frequently Asked Questions

How often can I reset my Fujitsu air conditioner?

Occasional resets after a power outage are fine. If you need to reset the system repeatedly, that usually indicates an underlying fault that needs inspection. Regular resets should not be part of normal operation.

Will resetting fix a blinking green light?

In many cases, yes. A flashing green light often indicates a communication error triggered by a power fluctuation. If the light stops flashing after a proper isolation reset, the issue was likely temporary. If it continues flashing, a technician should assess it.

Why does my Fujitsu turn on and then shut off?

This can happen due to sensor faults, dirty filters restricting airflow, overheating protection, or electrical supply issues. A reset may fix a temporary glitch, but if shutdown happens repeatedly within minutes, professional diagnosis is recommended.

Does resetting damage the system?

No. Performing a proper power isolation reset does not damage the unit. In fact, it is a safe first troubleshooting step recommended before booking service.

Can I reset the system using only the remote?

Turning the unit off and on with the remote is not a true reset. A full reset requires isolating power at the breaker and wall switch. Remote resets only address minor control glitches.

Final Thoughts

If your Fujitsu air conditioner has stopped working, don’t assume the worst straight away.

A proper reset fixes many common post-storm and power outage issues in under 10 minutes.

But if faults keep returning, breakers trip repeatedly, or the unit is older than 10 years, it may be time to look at repair costs versus replacement.