Fujitsu AC Error Code E:EE — System Inspection Needed Fix

What it means

Fujitsu air conditioner E:EE is the general error indication documented in Fujitsu's UTY-RNNUM self-diagnostic PDF.
Fujitsu's exact guidance: 'When the error indication "E:EE" is displayed, inspection of the air conditioning system is necessary. Switch the unit off and press the Temp up and Temp down buttons simultaneously for 3 seconds.'
E:EE itself isn't the actual fault — it's the indicator that a fault exists.
The Temp Up + Temp Down hold for 3 seconds displays the specific underlying code (E:01, E:11, E:14, etc.) which tells you what's actually wrong.

Affected Models

Fujitsu wall-mounted residential split systems (ASU series indoor, AOU series outdoor)
Fujitsu Halcyon mini-split residential and light commercial models
Fujitsu Inverter split systems with the standard Fujitsu remote (UTY-RNNUM family remotes)
Fujitsu ASUG09LZAS, ASUG12LZAS, and similar consumer split models
Fujitsu's documentation: E:EE indicates inspection needed — the Temp Up/Down combo reveals the specific code

Common Causes

Underlying fault — could be any of dozens of specific E:XX codes
Communication issue between indoor and outdoor (often paired with E:01 or E:11)
Sensor fault somewhere in the system
Outdoor unit PCB fault
Refrigeration cycle issue (paired with E:16 or similar pressure codes)

How to Fix It

Switch the unit off at the remote.

Press the Off button on the Fujitsu remote.
Wait until the indoor unit's operation lamp goes dark.
This puts the system into the state Fujitsu's self-diagnostic procedure expects.
Hold Temp Up + Temp Down for 3 seconds.

On the Fujitsu remote, press and hold the Temp Up button and the Temp Down button simultaneously for 3 full seconds.
The remote enters self-diagnostic mode.
Point the remote at the indoor unit and the indoor unit's display (or operation lamp flash pattern) shows the specific underlying code.
Note the displayed code.

Write down the exact code shown — it's typically in the format E:XX where XX is two digits or letters.
Common Fujitsu codes: E:01 (indoor-outdoor communication), E:02 (room sensor open), E:11 (outdoor PCB fail / serial communication), E:14 (outdoor PCB), E:16 (pressure switch), among others.
Look up the specific code's fix.

Each specific Fujitsu E:XX code has its own diagnostic and fix path — they're not interchangeable.
OnlyErrorCodes covers the most common ones; for less common codes, check the Fujitsu service manual for your specific model.
Don't try to fix E:EE in isolation — fix the underlying code that the diagnostic display revealed.
Exit diagnostic mode.

Once you've noted the code, hold Temp Up + Temp Down again for 3 seconds to exit self-diagnostic mode.
The remote returns to normal operation.
You can now power the unit back on if you want to verify the fault still triggers (it will, until the underlying code's cause is fixed).

When to Call a Professional

E:EE itself doesn't tell a technician what to fix — it just says a fault exists.
Before scheduling Fujitsu service, do step 1 (display the specific code).
That underlying code determines whether the fix is owner-doable (E:02 sensor swap) or requires Fujitsu service (E:14 PCB replacement).

Frequently Asked Questions

I held the buttons but nothing showed — what happened?

A few possibilities.
One: the remote needs to be aimed directly at the indoor unit's IR receiver, and within range (3-5 metres in a clear line of sight).
Two: the remote's batteries may be low — the IR signal weakens before the LCD goes blank, so swap in fresh batteries and retry.
Three: some Fujitsu remotes use a slightly different button combination (older remotes used Fan + Test instead of Temp Up + Temp Down) — check the remote's printed quick guide on the back, or your unit's service manual.
Four: the unit's IR receiver itself may have failed, in which case Fujitsu service is needed to read the fault via the outdoor unit's diagnostic LEDs instead.