01
Power supplies
Dedicated circuits, switchboard protection, isolators and supply-side work for HVAC plant and associated equipment.
HVAC Electrical & Controls
When the air-conditioning fault is actually an electrical or control problem.
AESS supports HVAC systems from the electrical side — dedicated supplies, isolators, contactors, control circuits, relays, interlocks, interfaces and fault finding. For mechanical and refrigeration work, we work alongside appropriately licensed HVAC contractors so each part of the job is handled by the right trade.
Where AESS fits
The HVAC unit may be mechanical. The system around it is often electrical.
Commercial air-conditioning and refrigeration equipment depends on power supplies, controls, protection and interfaces before the mechanical system can do its job. That makes electrical and control fault finding a critical part of many HVAC call-outs and projects.
02
Controls
Control circuits, contactors, relays, timers, interlocks and electrical components that start, stop and coordinate HVAC equipment.
03
Interfaces
Electrical interfaces between HVAC equipment and other systems such as fire, building controls, pumps, fans or external enable signals.
04
Fault finding
Identify whether a non-operating system has an electrical supply fault, control fault or another issue that needs the mechanical contractor.
05
Plant replacement support
Electrical alterations and new supplies when HVAC plant is replaced, upgraded or moved as part of a broader mechanical project.
06
Commercial maintenance
Electrical repairs and control work associated with HVAC systems in operating commercial and industrial sites.
HVAC controls
Sometimes the compressor is fine — it just never receives the right instruction.
Controls can sit between the obvious symptom and the actual equipment fault. A unit that will not run may have perfectly serviceable mechanical components but no enable signal, a failed contactor, broken control circuit or an upstream interlock preventing operation.
✓
Contactors and relays
Check switching devices, coils, contacts and control supply where equipment is failing to start or hold in.
Check switching devices, coils, contacts and control supply where equipment is failing to start or hold in.
✓
Control circuits
Trace low-voltage and mains-voltage control circuits where the fault sits in the electrical control path.
Trace low-voltage and mains-voltage control circuits where the fault sits in the electrical control path.
✓
Interlocks
Identify whether another device or safety condition is deliberately preventing equipment from operating.
Identify whether another device or safety condition is deliberately preventing equipment from operating.
✓
External interfaces
Work with enable signals, shutdown contacts and electrical interfaces between HVAC plant and other building systems.
Work with enable signals, shutdown contacts and electrical interfaces between HVAC plant and other building systems.
Fault finding
First question: is this actually an electrical fault?
The most useful result is not always “we fixed it”. Sometimes it is identifying which trade actually owns the fault so the client stops paying people to guess.
No powerBreaker tripContactor failureNo enable signalInterlock activeControl supply fault
What we work through
Does the plant have the correct supply?Check the circuit, protection, isolators and electrical supply conditions before assuming the mechanical plant has failed.
Is the equipment being told to run?A control or enable fault can stop otherwise serviceable equipment from operating.
Is another system intentionally holding it off?Fire, safety, condensate, pressure or other interlocks can prevent operation by design.
Has the fault crossed into the mechanical system?Once the electrical and control side is verified, the appropriately licensed HVAC contractor can concentrate on the mechanical/refrigeration fault rather than repeat the same electrical checks.
Commercial HVAC electrical
Particularly useful where several trades meet on the same system.
AESS regularly works around commercial and industrial equipment where controls, mechanical services, electrical distribution and the operating site all overlap.
A
Packaged & split systems
Electrical supplies, isolators, control interfaces and fault finding associated with commercial air-conditioning plant.
B
Fans & ventilation
Electrical controls, starters, contactors, interlocks and supplies associated with ventilation and air-handling equipment.
C
Pumps & auxiliaries
Electrical circuits and control interfaces for pumps and other equipment operating as part of the HVAC system.
D
Equipment replacement
Alter existing supplies or install new electrical infrastructure when plant capacity or equipment arrangement changes.
E
Operating sites
Plan electrical works and shutdowns around trading, production or site-access constraints where practical.
F
Integrated maintenance
HVAC electrical issues can be handled inside the same broader commercial electrical relationship as lighting, power, switchboards and equipment.
Trade coordination
One fault can legitimately need two trades.
That is not a failure of diagnosis — it is how complex systems are built. AESS can handle the electrical and controls work alongside an appropriately licensed air-conditioning/refrigeration contractor so the trades can prove their respective parts of the system rather than working in isolation.
A cleaner handover between trades
If AESS verifies that the supply and controls are correct, the mechanical contractor gets a much clearer starting point. If the HVAC contractor identifies an electrical or control defect, AESS can deal with that part without asking the mechanical technician to work outside their scope.
Discuss an HVAC controls faultHow we approach it
Separate the electrical fault from the mechanical fault.
1
Understand the symptom
What is not running, what changed, what fault information exists and what other systems interact with the equipment?
2
Verify supply & controls
Test the relevant electrical supply, switching and control path within the electrical scope.
3
Repair or identify the boundary
Repair the electrical fault where appropriate or hand a verified mechanical/refrigeration issue to the licensed HVAC contractor.
4
Prove the interface
Where both trades are involved, confirm the electrical and mechanical parts operate together as intended once the separate work is complete.
ToowoombaDarling DownsLockyer ValleyWestern DownsSurrounding SEQRegional commercial work
Common questions
HVAC electrical & controls FAQs.
Does AESS install or repair the refrigerant side of air-conditioning systems?
No claim is made that AESS performs the regulated mechanical/refrigeration scope. AESS handles electrical supplies, controls, interfaces and electrical fault finding, working alongside an appropriately licensed HVAC contractor where mechanical or refrigeration work is required.
Can you fault-find why an air conditioner will not start?
Yes, where the issue may be on the electrical or control side. AESS can verify the supply, isolators, protection, contactors, relays, control circuits and relevant electrical interfaces and identify when the fault instead sits in the mechanical system.
Can you install the electrical supply for a new air-conditioning unit?
Yes. AESS can install the dedicated electrical supply, protection and isolator and coordinate that work with the appropriately licensed contractor responsible for the HVAC installation.
Do you work on commercial HVAC controls?
Yes. AESS regularly works on electrical control circuits and interfaces associated with commercial HVAC plant and other electrically controlled equipment.
Can you work with our existing air-conditioning contractor?
Yes. AESS can work alongside the client's existing licensed HVAC contractor or other suitably licensed mechanical-services provider.
Can HVAC work be part of a larger commercial electrical project?
Yes. Where a site upgrade includes new plant, switchboard work, electrical capacity changes or wider building alterations, the HVAC electrical scope can be planned as part of the broader commercial electrical project.
Queensland Building and Construction Commission guidance treats constructing, installing, replacing, repairing, altering, maintaining, testing and commissioning air-conditioning and refrigeration systems as mechanical-services work requiring the relevant licensing. This page describes AESS's electrical and controls scope and coordination with appropriately licensed HVAC contractors.
HVAC electrical enquiry
Tell us what the plant is — and what it refuses to do.
Send us the equipment type, site, symptoms and any fault information you have. If your HVAC contractor has already identified an electrical or controls issue, include their notes and we can start from there.