Fault finding and repair
Air Conditioner Repairs Perth
When your system quits on a sweltering afternoon, you want a clear diagnosis rather than guesswork. We book air conditioner repairs Perth residents need for split system and ducted reverse cycle units, and send a licensed technician to find the real cause.
Symptoms first
Is Your Air Conditioner Not Cooling in Perth?
A unit that hums along but blows lukewarm air is a very frequent reason people call. In Perth, it usually shows up on the first properly hot day of the season, when the system is asked to work flat out after months of light use.
Several faults can cause it. Some are simple, such as a blocked filter or a mode setting that was changed in winter. Others need a technician, including a failed capacitor, a low refrigerant charge from a leak, or a compressor that no longer starts.
Before you book, it helps to rule out the easy things. Check the remote is set to cool, look at the filters, and make sure the outdoor unit is actually running. Our air conditioner troubleshooting page walks through these checks. If nothing changes, an AC repair in Perth is the next step.
What breaks
Which Air Conditioning Faults Need a Technician?
Some problems can be handled at home, but most mechanical and electrical faults cannot. The lists below separate the signs you might notice from the parts that often turn out to be responsible.
Signs You May Notice
- Air coming out at room temperature or only slightly cool
- Outdoor unit silent while the indoor fan runs
- Indoor head leaking water down the wall
- Loud clicking, grinding or high pitched squeal
- Breaker trips as soon as the compressor starts
- Unit shuts off after a few minutes and restarts
- Frost or ice on copper pipes near the wall
- Burning or electrical smell at start up
Parts Often Responsible
- Start or run capacitor that has weakened in the heat
- Outdoor fan motor with worn bearings
- Refrigerant leak at a flare joint or coil
- Blocked condensate drain line or pump failure
- Faulty temperature sensor or thermistor
- Control board damaged by a power surge
- Contactor with pitted or burnt contacts
- Seized indoor blower or cracked fan wheel
Please avoid opening the outdoor unit yourself. Capacitors can hold a charge after the power is off, and refrigerant circuits are legally restricted work. The technicians we arrange hold the licences their work requires, including ARCtick licensing for refrigerant handling.
The Perth factor
Why Do So Many Air Conditioners Break Down in Perth Heatwaves?
Perth summers are long and dry, and the heat often builds over several days. Extended runtimes are tough on components that were already ageing. As a result, breakdown calls tend to spike in the middle of a hot spell rather than at the start.
Heat Stress on Electrical Parts
Capacitors and contactors sit inside the outdoor unit, often in full sun. On a scorching afternoon, the inside of that casing gets much hotter than the air. Capacitors in particular lose strength with heat and age, and a weak one may stop the compressor from starting at all.
Dust Carried on Easterly Winds
Dry easterlies push fine dust across the metro area. When it coats the condenser coil, the system cannot shed heat properly. Pressures rise, the compressor works harder, and protective cut outs may trip. In suburbs near new housing developments, such as Baldivis, Ellenbrook and parts of Wanneroo, sand adds to the problem.
Corrosion Near the Ocean
Homes in Scarborough, Cottesloe and Fremantle face salty air most days. Corrosion attacks coil fins, screws and electrical terminals over time. Eventually, a corroded connection can fail or a pinhole leak can form in a coil.
Late or Missing Sea Breeze Inland
The afternoon sea breeze cools coastal suburbs, but areas like Midland, Kalamunda and Armadale often stay hot well into the evening. Systems there run longer each day, so wear builds up faster.
How it works
How Does a Repair Visit Work From Start to Finish?
Good repairs start with good information. The more you can tell us when you call, the better we can match the job to the right technician.
Describe the Problem
Tell us what the unit is doing, when it started, the brand and whether it is a split or ducted system. Photos of a fault code or the model sticker help.We Book a Licensed Technician
We arrange a technician who works in your part of Perth and confirm a time window with you.On Site Diagnosis
The technician checks power supply, controls, sensors and the outdoor unit. Measurements are taken while the system tries to run, which helps narrow down the fault.Clear Explanation and Options
You are told what failed, why it likely failed and what fixing it involves. If a part must be ordered, you are told before anything proceeds.Repair and Testing
Once you approve, the repair is completed. The system is then run and tested in cooling mode to confirm it performs as it should.Advice to Prevent a Repeat
Many faults have an underlying cause, such as a clogged coil. The technician will point out anything that could lead to the same problem again.
System types
Do Split System and Ducted Repairs Differ?
Yes, quite a bit. Both use the same basic refrigeration cycle, but the layout and access points change how a technician approaches the job.
Split System Repairs
Wall mounted splits keep most of their parts within easy reach. Common jobs include replacing fan motors, clearing drain blockages, swapping sensors and fixing refrigerant leaks at the flare connections. For more on keeping them healthy, see our split system service Perth page.
Ducted System Repairs
Ducted systems split their work between a roof space indoor unit, an outdoor condenser and a network of ducts and zones. Faults can sit in any of these places. Our ducted air conditioning service Perth page explains the regular maintenance side.
Multi head systems, where one outdoor unit runs several indoor heads, sit somewhere in between. A fault on one head can affect the others, so diagnosis takes a little longer.
Access matters too. A split head mounted high above a staircase, or an outdoor unit on a second storey wall, may need extra equipment. Apartment buildings in Subiaco or Victoria Park sometimes place condensers on shared rooftops, so building access needs organising ahead of time. Mentioning these details when you book saves a wasted trip and gets your system running again sooner.
Finally, older ducted systems in established suburbs like Willetton and Morley may have controllers or parts that are no longer made. In those cases, a technician may suggest a compatible replacement part or a modern controller upgrade instead.
Real situations
What Do Typical Perth Repair Calls Look Like?
Every fault has its own story, but certain patterns repeat across the city. These examples are general descriptions of common situations, not specific jobs, and they show how location and home type shape the problem.
The Hills Home That Never Cools Down
A family in the Kalamunda foothills notices the living room split running all evening without reaching the set temperature. Often the condenser coil is caked with dust from summer easterlies, and the fan motor is tiring. Cleaning the coil and replacing a weak part usually restores performance.
The Coastal Unit With a Slow Leak
A unit near the beach in Scarborough cools well in spring but fades by February. Salt has corroded part of the outdoor coil, and a tiny leak has let refrigerant escape. The technician locates the leak, then discusses whether a repair or coil replacement makes sense.
The New Estate Drain Problem
In a recently built home in Baldivis or Ellenbrook, water starts dripping from a bedroom split. Construction dust and fine sand have partly blocked the drain, and the line was run with too little fall. Clearing it and correcting the slope fixes the leak.
These patterns help explain why a quick visual check is rarely enough. A proper diagnosis looks at the environment around the unit as well as the unit itself.
Ducted faults
What Goes Wrong With Ducted Systems in Perth Roof Spaces?
Ducted systems have a few failure points that splits do not. Most of them relate to the roof cavity, which in a Perth summer can become far hotter than any room in the house.
- Flexible ducts that have split, collapsed or come loose from outlets
- Zone motors that stick open or closed, leaving rooms too hot
- Condensate trays overflowing onto ceilings below
- Wall controllers that lose communication with the indoor unit
- Return air filters so clogged that the system starves for air
- Fan motors failing after years of running in extreme roof heat
A loose duct in a hot roof can dump cooled air straight into the ceiling space. The system runs constantly, yet the rooms barely change. Tracking down that kind of fault takes time in the roof, which is why morning visits are usually best.
Refrigerant issues
What If the Problem Turns Out to Be Low Refrigerant?
Air conditioners are sealed systems. Refrigerant does not get used up like fuel. So if the charge is low, there is a leak somewhere, even if it is very small.
A responsible technician will look for that leak before adding refrigerant. Otherwise, the new gas simply escapes again and you pay twice. Common leak points include flare nuts on the pipe connections, the indoor coil and corroded sections of the outdoor coil.
Once the leak is found and repaired, the system is pressure tested, evacuated and recharged to the correct amount. We explain this process in detail on our split system regas Perth page. Generally, a regas with a leak repair costs more than a standard service, so it is worth confirming the diagnosis first.
Repair or replace
Should You Repair or Replace an Older Air Conditioner?
This is a fair question, and there is no single answer. A technician can only advise properly after testing the system. Still, a few factors usually guide the decision.
- Age of the unit and how long it has been in service
- Whether the fault is a small part or a major component like the compressor
- Availability of replacement parts for that model
- The refrigerant type the system uses
- Overall condition of the coils, especially in coastal suburbs
- How well the unit has been cooling the space in recent summers
- Whether the system was correctly sized for the room in the first place
Small repairs on a well kept unit are often good value. On the other hand, an old system with a failed compressor and corroded coils may not be worth saving. Either way, you should get an honest view and the final decision is yours.
Brands we repair
Which Brands Can Be Repaired in Perth?
The technicians we arrange work on the major reverse cycle brands sold in Western Australia. Each brand has its own controls, fault code systems and common weak points, which our Perth brand pages describe.
Daikin Repairs
Split and ducted Daikin systems, including popular wall units.
Mitsubishi Repairs
Mitsubishi Electric and Mitsubishi Heavy Industries units.
Panasonic Repairs
Reverse cycle splits and ducted Panasonic systems.
Samsung Repairs
WindFree and standard Samsung split systems.
Fujitsu Repairs
Fujitsu Lifestyle splits and ducted units.
LG Repairs
LG inverter splits, including Dualcool models.
Hitachi, Toshiba, Haier and Carrier systems can usually be looked at too. We are independent and not an authorised dealer for any brand. If your unit is still under manufacturer warranty, contact the brand first, as outside repairs may affect a claim.
Where we go
Where in Perth Can We Send a Repair Technician?
Repair bookings come from right across the metro area. Northern suburbs such as Joondalup, Wanneroo and Ellenbrook have many newer homes with modern inverter splits. Meanwhile, older established areas like Morley, Stirling and Willetton have a mix of ageing ducted systems and newer replacements.
We also cover the eastern foothills around Midland and Kalamunda, the south eastern corridor through Cannington, Canning Vale and Armadale, and the southern coast from Cockburn through Rockingham and Baldivis to Mandurah. Inner and western suburbs include Subiaco, Victoria Park, Scarborough, Cottesloe and Fremantle.
For the full picture of what we do in the city, visit our Perth air conditioning hub. Other cities are listed on the locations page, and you can read about our air conditioning service Australia wide.
Good to know
What Can You Do While Waiting for a Repair?
If your system has failed on a hot day, a few safe steps can help in the meantime. They also give the technician useful information on arrival.
Open more detail
Turn It Off if Something Seems Wrong
If you hear grinding, smell burning or see the breaker trip repeatedly, switch the unit off at the isolator. Running a faulty system can turn a small repair into a large one.
Note Any Fault Codes
Many modern units flash a light pattern or show a code on the display. Write it down or take a short video. Different brands use different systems, so the technician can interpret it with the model number.
Clear Space Around Both Units
Make sure the technician can reach the indoor head and the outdoor unit easily. Move furniture, open gates and secure pets before the visit.
Keep the House Cooler Passively
Close curtains on west facing windows by early afternoon. Once the sea breeze arrives, open windows on the shaded side of the house to draw cooler air through. In double brick homes, airing out in the evening helps the walls release stored heat.
Catch Any Water Leaks
If the indoor unit is dripping, place a towel or container underneath and switch it off. Water can damage plaster, timber floors and electrical fittings over time.
Questions
Frequently Asked Questions
Why does my outdoor unit buzz but not start?
This is often a weak capacitor or a faulty contactor, both common in Perth heat. Switch the unit off and book a technician, as running it like this can stress the compressor.
Why is water leaking from my split system?
The usual causes are a blocked drain line, a dirty filter leading to coil icing, or an indoor unit that is not level. A technician can clear the drain and find the underlying cause.
Can you repair a system that keeps tripping the power?
Yes. Tripping can come from a failing compressor, a shorted fan motor, water in electrical parts or wiring faults. It needs proper testing rather than repeated resetting.
Do you fix evaporative coolers?
No. Our technicians focus on refrigerated reverse cycle split and ducted systems. Evaporative systems need a specialist in that equipment.
Will I know the cost before the repair starts?
Yes. Once the fault is diagnosed, the technician explains the repair and gets your approval before going ahead.
Can a repair be done on the same visit?
Many repairs can be completed on the day if the part is common. Model specific parts sometimes need ordering, in which case a return visit is arranged.
Is it safe to keep using a unit that cools poorly?
It may run, but it is working harder than it should. That can lead to a bigger failure, so an early check is usually the better choice.
Keep reading
Which Other Perth Pages Might Help?
These pages cover related services and brands in Perth.
Need an Air Conditioner Repaired in Perth?
Call us with the symptoms and your suburb, and we will organise a licensed technician to diagnose and fix the fault.
Reviewed by AC repair and service specialist on 22 October 2026. How we write our articles