General guidance, not an inspection or diagnosis. Repair advice has not been independently reviewed by a tradesperson. How these guides are prepared.
What to do now
Turn the unit off if it is making abnormal mechanical noises, smells burnt, leaks heavily indoors or trips power.
Safe checks before booking
Only make these observations if there is no smoke, burning smell, water near electrics or other danger. Follow your own model’s user manual.
- Read the controller: confirm cooling mode and a temperature below the room temperature. Fan-only mode moves air without cooling it.
- Look at airflow: note whether furniture or curtains obstruct the indoor outlet and whether doors or windows are open.
- Check the maintenance record: tell the technician when filters were last cleaned. Only carry out user maintenance explicitly described by your manual and safely accessible.
- Record the result: note whether air is weak, warm, intermittent, or cool but not cooling the room. Photograph an accessible error display.
Do not open equipment covers, touch refrigerant pipework or repeatedly reset a tripping circuit. Manufacturer guidance supports checking settings, filters and room airflow before seeking service.
Describe the cooling problem precisely
| What happens | Useful detail to record |
|---|---|
| Little air from the indoor outlet | Whether fan settings change it and whether the filter maintenance is overdue. |
| Airflow feels normal but remains warm | Cooling mode, set temperature and whether all units are affected. |
| One room stays warm | Which rooms work, doors or zones in use, and when the problem occurs. |
| Cooling stops with a code or flashing light | The displayed code, timing and whether the fault returns. Do not erase it with repeated resets. |
| Water leaks indoors or power trips | Stop using the unit if safe. Keep clear of wet electrics and report this when arranging urgent help. |
These descriptions narrow the conversation; they are not diagnoses. See the AC water-leak guide if water is the main symptom.
Common causes
- Dirty filter or restricted airflow
- Refrigerant leak or low charge
- Outdoor unit / compressor fault
- Sensor or control problem
The exact cause cannot be confirmed from a symptom alone. The first professional should inspect before repair work is authorised.
What the professional may do next
- Check and clean accessible filters
- Inspect indoor and outdoor units
- Test temperatures and refrigeration circuit
- Repair or compare replacement
Australian AC diagnosis and repair cost guidance
Price checked 1 November 2026. AUD; provider example, not a national average or an endorsement.
Ideal Air Melbourne publishes a $292 first-visit fee including GST for up to an hour on one system, including travel and a written report. Parts and repairs are quoted separately. Its multi-head and additional-system rules differ, so confirm what counts as your system before booking.
Price source: Ideal Air Melbourne: service and repair pricing ↗
Ask whether the fee is for diagnosis, routine servicing or a repair, and whether it is credited against later work. Confirm extra time, parts availability, return visits, access equipment and approval of additional charges. A cleaning price is not a quote to repair an unidentified fault.
If replacement is proposed, ask for the diagnosis and repair alternative, then compare the complete installed replacement scope, electrical work and disposal. Compare your written quotes →
Who may be responsible?
Owner / landlord
Responsibility can depend on whether the unit is supplied with the property and whether routine filter cleaning is required by the occupant.
Tenancy, strata, insurance and boundary responsibilities vary by circumstance and state, so confirm responsibility before non-emergency work where practical.
Questions to ask before hiring
- Are you appropriately licensed or registered for this work in my state?
- Does the quote include call-out, labour, parts/materials, GST and disposal?
- What is excluded from the quoted scope?
- If you find additional damage, will you get approval before doing extra work?
- What workmanship or product warranty applies?
What to record before calling
Note whether one unit or several rooms are affected, when cooling stopped, the model and any displayed error code. Read labels only if accessible without moving equipment or opening covers. These observations help describe the fault; they do not establish its cause.
Which professional should assess it?
Start with an air-conditioning repair technician and describe the symptoms. Ask whether they hold the qualifications required for the work, including any electrical or refrigerant work. Do not remove panels or attempt work on wiring or refrigerant lines.
Questions specific to an air-conditioning quote
Does the fee cover diagnosis only or any repair? Are parts, further visits and access equipment included? If replacement is proposed, ask why repair is unsuitable and compare the full installed scope.
Sources and review status
Prepared for Home Triage Australia. Updated 1 November 2026. This guide has not been independently reviewed by a qualified tradesperson. The sources below support general maintenance and hiring principles, not a diagnosis of your property.
Run this problem through the checker, then contact a suitable professional of your choice.
Run air conditioner not cooling triage →