Refrigerant leak testing and recharge
Split System Regas Perth
If your split system runs but no longer cools properly, refrigerant could be the issue. We arrange split system regas Perth bookings with ARCtick licensed technicians, who find and fix the leak first, then recharge the system to the correct amount.
The basics
What Is an Air Conditioner Regas?
Refrigerant is the substance that carries heat out of your home. It circulates between the indoor and outdoor units in a sealed loop of copper pipe. Indoors, it absorbs heat from the room. Outdoors, it releases that heat into the air.
A regas means restoring the correct amount of refrigerant to that loop. People also call it an aircon regas, a refrigerant recharge or a gas top up. The name matters less than the method, because a proper regas is more than connecting a bottle and adding gas.
Here is the key point. A healthy system should never need regassing. Refrigerant is not consumed like petrol. If the charge is low, it has leaked out somewhere. So any honest air conditioner regas in Perth starts with finding out why the gas went missing.
Why Does Perth Heat Expose Low Refrigerant?
A system that is slightly undercharged may seem fine in spring. The real test comes when the outside temperature climbs and stays high for days. On those days, the refrigerant has to move a large amount of heat out of a warm double brick house into air that is already very hot.
With too little refrigerant, the system simply cannot keep up. Rooms stay warm, the compressor runs without a break, and the unit may shut itself down to protect itself. That is why so many Perth households first notice a refrigerant problem in the middle of a heatwave, often in hotter eastern suburbs such as Midland and Kalamunda, where the sea breeze arrives late.
Does a Regas Restore Full Performance?
When the leak is fixed and the charge is correct, a system in otherwise good condition usually returns to its normal cooling capacity. If the unit ran low for a long time, though, the compressor may have suffered some wear. The technician’s performance test after recharging shows how well the system has recovered.
Symptoms
How Do You Know if Your Split System Needs a Regas?
Low refrigerant produces a fairly recognisable set of symptoms. However, several of them overlap with other faults, such as dirty coils or failing fans. That is why testing matters more than guessing.
Signs That Point to Low Gas
- Air from the indoor unit is cool but not cold
- Cooling gets gradually weaker over weeks or months
- Frost or ice on the smaller copper pipe outside
- Indoor coil icing up, followed by water dripping
- Outdoor unit runs constantly without the room cooling
- Hissing or bubbling sound near the pipes or indoor head
- Heating mode also seems weaker than it used to be
Faults That Look Similar
- Heavily clogged filters restricting airflow
- Dust or sand packed into the outdoor coil
- Weak capacitor preventing the compressor running
- Indoor fan running slowly or not at all
- Temperature sensor giving incorrect readings
- Unit undersized for the room it serves
- Wrong mode selected on the remote
Because the list on the right is just as common, a technician will rule those out first. If filters and coils are the real problem, a split system service Perth booking may be all you need.
Leak causes
Why Do Split Systems Leak Refrigerant in Perth?
Leaks can happen anywhere in the refrigerant circuit. Some come from installation, while others develop slowly from the environment. Perth conditions add a few local twists.
Flare Joints at Installation
Copper pipes connect to both units with flared fittings. If a flare was not made or tightened correctly, it can seep slowly for years. These are among the usual leak points on split systems.
Corrosion From Coastal Air
In beachside suburbs like Scarborough, Cottesloe, Fremantle and parts of Rockingham and Mandurah, salt air settles on outdoor coils. Over time, corrosion can eat through thin coil tubing and create pinhole leaks.
Vibration and Heat Cycling
Perth summers mean long run times. The compressor starts and stops many times, and pipes expand and contract with temperature. Over years, vibration can wear a pipe where it rubs against a bracket or another pipe.
Physical Damage
Outdoor pipe runs can be knocked by mowers, whipper snippers or renovation work. Sun damaged insulation leaves copper exposed, and pets or wildlife sometimes chew through what remains.
Dust carried on dry easterly winds does not cause leaks directly. However, a dust choked coil makes the system run at higher pressure, which can stress weak joints. That is one more reason to keep the outdoor unit clean.
How Can You Reduce the Risk of Future Leaks?
Not every leak can be prevented, but a few simple habits help. Keep garden equipment away from the outdoor pipe run, and ask any tradesperson working near the unit to take care. Replace cracked or missing pipe insulation, which Perth sun breaks down surprisingly quickly. In coastal homes, gently rinse the outdoor coil with fresh water every so often to wash away salt. Finally, a regular service gives a technician the chance to spot oily residue around joints, which is often the first visible sign of a slow leak.
Doing it properly
What Does a Proper Split System Regas Involve?
A correct regas follows a series of steps. Skipping any of them usually means the problem returns. Here is how a licensed technician typically approaches it.
Confirm Low Refrigerant
Gauges are connected and the system runs while pressures and temperatures are measured. Other causes of poor cooling are ruled out first.Find the Leak
The technician uses electronic leak detection, bubble solution or other methods to locate the leak. Flare joints, valves and coils are checked closely.Repair the Leak
Depending on where it is, the fix might be re making a flare, replacing a valve core or repairing a section of pipe. A badly corroded coil may need replacement.Pressure Test
The system is pressurised, usually with dry nitrogen, and monitored to confirm the repair holds.Evacuate the System
A vacuum pump removes air and moisture from the circuit. Moisture inside a system can damage the compressor and cause blockages.Recharge to Specification
The correct type and amount of refrigerant is added, based on the manufacturer’s data plate and pipe length.Test Performance
The system runs while temperatures and pressures are checked. The technician confirms it is cooling as designed before leaving.
Licensing
Who Is Allowed to Regas Air Conditioners in Australia?
In Australia, anyone who handles refrigerant must hold the appropriate ARCtick licence. This applies to regassing, recovering refrigerant and any work that opens the sealed circuit. The rules exist because refrigerants can harm the environment if released.
The technicians we arrange hold the licences their work requires. We are a booking and dispatch service, so we match your job with a technician who is qualified to carry it out. If anyone offers to top up your gas without testing or without proper licensing, it is worth asking more questions.
DIY regas kits sold online are not a legal or sensible option for split systems. Adding the wrong refrigerant, or the wrong amount, can damage the compressor. It can also make future repairs harder and more expensive.
Licensed technicians also recover refrigerant properly when a system is repaired or removed, rather than venting it. They carry calibrated gauges, scales, vacuum pumps and leak detectors. That equipment is what allows a regas to be done accurately, with the charge weighed in to the manufacturer’s specification instead of estimated by feel.
Refrigerant types
Which Refrigerants Are Found in Perth Split Systems?
Different generations of split systems use different refrigerants. The type is printed on the data plate on the outdoor unit. A technician must use the same refrigerant the system was designed for.
R32
Most newer split systems sold in Australia use R32. It has a lower global warming potential than R410A and works efficiently in inverter systems. Many recent installations across Joondalup, Baldivis and other growing suburbs use it.
R410A
Widely used in split systems for many years before R32 became common. Plenty of R410A systems are still running well in established suburbs like Willetton, Morley and Stirling.
R22
An older refrigerant found in much older systems. It has been phased out under Australian rules, and supply has become very limited. Systems that use it and develop a leak often face a repair or replace decision.
Never mix refrigerants. If you are unsure what your system uses, take a photo of the outdoor unit’s data plate and send it through when you book.
Repair or replace
Is a Regas Worth It on an Older Split System?
It depends on several things. Generally, a regas with a leak repair costs more than a standard service. On a newer unit with a simple flare leak, it is often well worth doing. On an ageing unit with corroded coils, the value is less clear.
- The age and general condition of the system
- Where the leak is and how easy it is to repair
- Whether the coil shows widespread corrosion
- The refrigerant type and how available it is
- Compressor health after running with a low charge
- Whether the unit was sized correctly for the room
- Your plans for the home and how long you will stay
A technician can give you an honest view once they have tested the system. If replacement makes more sense, they will explain why. If you would like a broader diagnosis of a struggling unit, our air conditioner repairs Perth page explains the fault finding process.
Ducted too
Can Ducted Systems Need a Regas?
Yes. Ducted reverse cycle systems use the same refrigeration cycle as splits, just on a larger scale. Leaks can occur at the outdoor unit, in the pipe run or at the indoor fan coil in the roof.
Finding a leak in a ducted system can take longer, because part of the circuit sits in the roof space. In summer, that work is safest in the morning, before the roof heats up. The process otherwise follows the same steps: confirm, locate, repair, pressure test, evacuate and recharge.
For general upkeep of whole home systems, see our ducted air conditioning service Perth page. Please note that evaporative coolers, which are common in Perth, do not use refrigerant at all, and our technicians focus on refrigerated reverse cycle systems rather than evaporative units.
Brands
Which Split System Brands Can Be Regassed?
Any reverse cycle split system can be regassed by a licensed technician, provided the correct refrigerant is used and the leak is fixed. These are the brands installed most in Perth.
Daikin
Leak testing and recharging for Daikin split and ducted units.
Mitsubishi
Mitsubishi Electric and Mitsubishi Heavy Industries systems.
Panasonic
Panasonic reverse cycle splits and ducted units.
Samsung
Samsung WindFree and other inverter split systems.
Fujitsu
Fujitsu Lifestyle and other split ranges.
LG
LG Dualcool, Artcool and other inverter models.
Hitachi, Toshiba, Haier and Carrier systems can be handled too. We are an independent service and do not hold authorised dealer status with any manufacturer.
Service area
Which Perth Suburbs Can Book a Regas?
We arrange regas and leak repair work across Perth. Coastal suburbs, where corrosion leaks are more likely, include Scarborough, Cottesloe, Fremantle, Cockburn, Rockingham and Mandurah. Further inland, we cover the hotter eastern areas of Midland and Kalamunda.
In the north, technicians cover Joondalup, Wanneroo and Ellenbrook. Through the middle suburbs, we reach Stirling, Morley, Subiaco and Victoria Park. South of the river, our coverage includes Cannington, Willetton, Canning Vale, Armadale and Baldivis.
Visit our Perth air conditioning hub for every service in the city. For other cities, see the locations page, or read more about our air conditioning service Australia wide.
Good to know
What Else Should You Know Before Booking a Regas?
A few practical points help you get the most from a regas visit and avoid common misunderstandings.
Open more detail
Beware of Top Up Only Offers
A quick gas top up without leak testing may get the unit cooling for a while. But if the leak remains, the gas escapes again and you are back where you started. Always ask how the leak will be found.
Running a Low System Can Cause Damage
Refrigerant also helps cool the compressor. Running a system low on gas for a long time can overheat the compressor and shorten its life. If you suspect low refrigerant, switch the unit off and book a check.
Have the Data Plate Ready
The sticker on the side of the outdoor unit lists the refrigerant type and factory charge. A clear photo helps the technician arrive with the right equipment.
Check Your Troubleshooting Basics First
Before booking, confirm the remote is in cooling mode, the filters are clean and the outdoor unit is running. Our air conditioner troubleshooting guide covers these steps.
Plan Around the Heat
Leak detection is easier when the system can run for a while. If you can, book in spring or early summer, before the busiest heatwave weeks.
Questions
Frequently Asked Questions
How often does a split system need regassing?
Ideally never. A sealed system keeps its refrigerant unless there is a leak. If yours has needed gas more than once, the leak has not been fixed.
How long does a regas take?
It depends mostly on how long the leak takes to find and repair. The evacuation and recharge stages also need time to be done correctly.
Can I regas my air conditioner myself?
No. Refrigerant handling in Australia requires an ARCtick licence. DIY kits can also damage the system by adding the wrong gas or amount.
Why is there ice on my outdoor pipes?
Ice on the smaller pipe is often a sign of low refrigerant, although restricted airflow can cause it too. Turn the unit off and arrange a check.
Is a regas more expensive than a service?
Generally yes, because it involves leak detection, repair, evacuation and refrigerant. The technician will explain what is involved before starting.
Does salt air really cause refrigerant leaks?
Over time it can. Salt speeds up corrosion on outdoor coils, which may lead to pinhole leaks. Coastal homes benefit from regular rinsing and inspection.
Do evaporative coolers need regassing?
No. Evaporative coolers use water, not refrigerant. We focus on refrigerated reverse cycle split and ducted systems.
Related
What Other Perth Pages Can Help?
Browse related Perth services and brand guides.
Book a Split System Regas in Perth
Call with your suburb, brand and the symptoms you have noticed, and we will arrange an ARCtick licensed technician to test, repair and recharge your system.
Reviewed by AC repair and service specialist on 22 October 2026. How we write our articles