135+ 5 Star Reviews

Sydney Wide Service

Aircon Error Codes: ActronAir

Call Now Call 1300 621 887 We’re on the Way

ActronAir Air Conditioner Error Codes: Common Codes + What to Do

Is your ActronAir AC showing an error code? This is the system’s way of telling you something needs attention. This page covers the most common ActronAir AC error codes and what you can safely check before booking a repair.

For fast help across Sydney and NSW, book an inspection through our Air Conditioning Repair or Emergency Air Conditioning Repair service.

Quick Safety Note Before Troubleshooting Your ActronAir AC

Before doing anything:

Do not remove panels or access wiring.
Do not attempt DIY electrical repairs.
If needed, turn the AC unit off at the isolator and wait a few minutes before restarting.
If you smell burning, hear buzzing, see smoke, or the system keeps tripping power, turn the AC off and call a technician immediately.

Stay Cool, Call the Experts Call 1300 621 887

Common ActronAir AC Error Codes: A Homeowner-friendly Guide

Below are common ActronAir error codes that customers usually run into. We’ve included the most likely meaning, the typical causes, where they usually appear, and helpful video guides.

Note: Some codes mean slightly different things depending on the controller. If you don’t see your error code listed here, it may be model-specific. A technician can confirm the exact cause using the unit’s model details.

Error Code	What It Means	Common Causes	Common On:	Safe Checks
E1 / EL01	Communication loss between indoor and outdoor units.	Power surges that damage components in the boards.	WC-02 Controllers (Ducted & Split)	WC-02 Controller Troubleshooting Video
E3	‣ WC-02: Indoor fan speed issue ‣ L-series, QUE, & NEO: Problem with the sensors	‣ WC-02: Dirty filters, indoor unit fans not working ‣ L-series, QUE, & NEO: Component failures, walls have recently been repainted	‣ WC-02 Controllers (Ducted & Split) ‣ NEO Controller (Ducted) ‣ QUE Controller (Ducted) ‣ L-Series Controller (Ducted)	‣ WC-02 Controller Troubleshooting ‣ NEO Controller Troubleshooting ‣ QUE Controller Troubleshooting ‣ L-series Controller Troubleshooting
E6	The ducted system’s discharge temperature is too high.	System has lost refrigerant	‣ NEO Controller (Ducted) ‣ QUE Controller (Ducted) ‣ L-Series Controller (Ducted)	‣ NEO Controller Troubleshooting ‣ QUE Controller Troubleshooting ‣ L-series Controller Troubleshooting
E7	There is an error with the outdoor coil sensor.	System may have component failures	‣ NEO Controller (Ducted) ‣ QUE Controller (Ducted) ‣ L-Series Controller (Ducted)	‣ NEO Controller Troubleshooting ‣ QUE Controller Troubleshooting ‣ L-series Controller Troubleshooting
E9	System may have a problem with low pressure.	Clogged filters, obstructed outdoor units, issue with system fans	‣ NEO Controller (Ducted) ‣ QUE Controller (Ducted) ‣ LM7 Controller (Ducted) ‣ LR7 Controller (Ducted)	‣ NEO Controller Troubleshooting ‣ QUE Controller Troubleshooting ‣ LM7 Controller Troubleshooting ‣ LR7 Controller Troubleshooting
EH03	There is an indoor fan speed issue.	Dirty filters, indoor unit fans not working	Wall-hung split indoor units	WHS Indoor Unit Troubleshooting
EC / EL0C	Your system may have a pressure fault.	Dirty filters, indoor unit fans not working, blocked fans	‣ WC-02 Controller (Split) ‣ Wall-hung split indoor units	‣ WC-02 Controller Troubleshooting ‣ WHS Indoor Unit Troubleshooting
EE	There is a problem with the water level alarm.	Float switch malfunction, drain pump malfunction	WC-02 Controller (Ducted)	WC-02 Controller Troubleshooting
E8	There is a discharge sensor error.	System may have component failures	‣ NEO Controller (Ducted) ‣ QUE Controller (Ducted) ‣ L-Series Controller (Ducted)	‣ NEO Controller Troubleshooting ‣ QUE Controller Troubleshooting ‣ L-series Controller Troubleshooting
E9	Your system may have a problem with low pressure.	Clogged filters, obstructed outdoor units, issues with system fans	‣ NEO Controller (Ducted) ‣ QUE Controller (Ducted) ‣ LM7 Controller (Ducted) ‣ LR7 Controller (Ducted)	‣ NEO Controller Troubleshooting ‣ QUE Controller Troubleshooting ‣ LM7 Controller Troubleshooting ‣ LR7 Controller Troubleshooting
E10	Your system may have a problem with low pressure or high pressure.	Clogged filters, obstructed outdoor units, issue with system fans	‣ NEO Controller (Ducted) ‣ QUE Controller (Ducted) ‣ LR7 Controller (Ducted)	‣ NEO Controller Troubleshooting ‣ QUE Controller Troubleshooting ‣ LR7 Controller Troubleshooting
E51	Loss of communication between the indoor and outdoor units.	Power surges may have damaged components within the boards.	LR7 Controller (Ducted)	LR7 Controller Troubleshooting

Quick tip: If an error code clears after cleaning fliters and power cycling, but returns within 24-48 hours, it’s usually a sign of an underlying fault and not just a one-off interruption.

What the Codes Generally Mean

Communication Errors (E1 / EL01/ E51): The indoor and outdoor units are losing connection, and the error is often linked to power issues, control boards, or wiring faults.
Fan and Airflow Errors (E3 / EH03 / EC / EL0C): These codes are usually related to blocked filters, poor airflow, or fan performance.
Pressure and Temperature Errors (E6 / E9 / E10): Usually caused by airflow restrictions, but may also indicate refrigerant or compressor issues.
Drainage Errors (EE): An error often linked to a blocked drain line, float switch, or drain pump.

Stay Cool, Call the Experts

General Troubleshooting Steps to Fix Common Error Codes

Before calling a technician to help, perform these basic checks that may solve a large percentage of consumer-level error codes. They’re safe to do, and you don’t need to open the AC unit.

1. Power reset (the safe method)
- Turn the system off at the controller.
- Switch it off at the isolator or breaker.
- Wait for 3-5 minutes.
- Turn the power back on and restart.
2. Clean the air filters

Dirty filters are one of the most common triggers for E3, EH03, EC, and EL0C codes, and pressure-related warnings. Clean filters also improve airflow and reduce the strain on the system.
3. Check the outdoor unit has clear airflow

Make sure the outdoor unit isn’t blocked by boxes or storage, leaves, fencing that sits too close to the unit, or heavy dust buildup.
4. Check for drainage problems (ducted or split)

If you notice water dripping indoors, damp patches near vents, a musty smell, or pooling near the indoor unit, turn the AC system off and book a technician to prevent water damage.
5. See if the controller is responding properly

If the screen is frozen, unresponsive, or showing repeated faults, it may be a controller or board issue, especially after storms or outages.

Get a Free Quote Today

Call Now Call 1300 621 887 We’re on the Way

When Should You Call a Technician?

Some errors are a sign of faults that require proper testing and repair by a licensed professional. These faults may involve sensors, refrigerant levels, fan motors, control boards, or compressor performance, and thus, should not be DIY’d.

Book a technician if:

The same code returns right after a reset.
The unit stops cooling or heating properly.
The system is starting and stopping frequently.
The breaker keeps tripping.
You see signs of refrigerant or compressor issues.
You hear odd noises from the outdoor unit.

Limited Time Only

Save Big! on Air Conditioning

Act Fast – Limited-Time Offers Ending Soon

135+ 5 Star Reviews

What Our Sydney Clients Say

At Air Care Solutions, we believe the true measure of service is in results and feedback. Many of our clients appreciate not just the outcome—but the way we work: arriving on time, explaining clearly and leaving the site as tidy as we found it.

“Professional Service You Can Trust!”

Thanks to the team at Air Care solutions for there swift response to coming out to service and fix the issues with my ducted system. There quick action, with an honest assessment with a diagnosis, were able to fix the issues quickly. Good pricing and reliable service, would highly recommend.

P

Pierce Lehane

Google Verified
“Trusted for Over 5 Years”

I have been utilising the services of Carl at Air Care Solutions for over 5 years. He installed 2 units and maintains them regularly. He responds immediately to my calls and provides an excellence service. i recommend him and his business unreservedly.

R

Renee Mill

Google Verified
“Fast Quote & Installation”

Prompt communications and inspection. Quote and installation was speedy. The guys turned up on time, and ensured all rubbish was removed. Units look great, working well.

J

Julia Nihill

Google Verified
“Exceptional Weekend Service - ”

Thanks to the team at Air Care solutions for there swift response to coming out. Exceptional, friendly service. We phoned on a Friday afternoon, had an onsite visit and quote Saturday morning, and a new air conditioning unit installed by midday Monday. Carl was very transparent with the costs involved, including any additions above the original quote. The team took great care to minimise any mess during installation, and made the whole process very simple.

R

Rachel Cooksley

Google Verified
“Honest & Easy”

The experience with Air care Solutions was honest and easy, to be installed the week before Christmas on short notice was a blessing! Lovely guys, thank you

L

Linda Merison

Google Verified

Proudly Servicing All of Sydney

From the CBD to the suburbs, we deliver expert air conditioning services Sydney-wide. No matter where
you are, our team is ready to keep you comfortable year-round.

Aircon Error Codes: ActronAir

ActronAir Air Conditioner Error Codes: Common Codes + What to Do

Common ActronAir AC Error Codes: A Homeowner-friendly Guide

What the Codes Generally Mean

General Troubleshooting Steps to Fix Common Error Codes

1. Power reset (the safe method)

2. Clean the air filters

3. Check the outdoor unit has clear airflow

4. Check for drainage problems (ducted or split)

5. See if the controller is responding properly

When Should You Call a Technician?

The same code returns right after a reset.

The unit stops cooling or heating properly.

The system is starting and stopping frequently.

The breaker keeps tripping.

You see signs of refrigerant or compressor issues.

You hear odd noises from the outdoor unit.

Save Big! on Air Conditioning

What Our Sydney Clients Say

Proudly Servicing All of Sydney

St Leonard's

Need Help With an ActronAirError Code in Sydney?