Air conditioner maintenance: what to watch between services

Keep the indoor and outdoor model numbers, installation date, warranty and last service report together. If the home has multiple systems, give each a plain label such as “living room” or “upstairs bedrooms”. A photo of an accessible label can save confusion when arranging parts.

Add a note when something changes: a particular room becomes uncomfortable, the unit starts making a new noise or water appears indoors. Include the operating mode and weather at the time. This helps distinguish a recurring fault from a one-off observation.

The Australian Government recommends keeping air-conditioner filters and vents clean and arranging regular professional service inspections. Use the appliance manual for the correct method and interval, because filter types and access differ.

Only carry out the user maintenance described by the manufacturer where it can be done safely. Do not climb into a roof, remove fixed electrical covers or apply water to powered equipment to reach a dirty part. If safe access is difficult, include the filter task in the service booking.

Notice whether air reaches the expected rooms, whether a zone responds to the controller and whether new vibration or unusual sounds occur. On a ducted system, record which outlets perform differently. This is more useful than assuming the outdoor unit is the problem.

Keep the accessible area around outdoor equipment free of stored items and avoid blocking grilles. Use the manufacturer’s required clearances rather than guessing a distance. Tell the technician about garden growth or building work that changed airflow or access.

A leak onto the wall, repeated electrical tripping or a persistent error code should be reported when booking. A general cleaning appointment may not allow enough time or parts for diagnosis. Leave a repeatedly tripping system off and ask for advice.

Do not request a routine gas top-up as a substitute for testing. Refrigerant symptoms require diagnosis. The Australian Refrigeration Council requires the appropriate refrigerant handling licence for work involving fluorocarbon refrigerant or equipment components that risk its release.

Share the maintenance record, unit count and access details. Tell the technician about high walls, stairs, restricted roof spaces or an outdoor unit behind a locked gate. Ask what cleaning is included and how additional repairs will be authorised.

After the service, keep the findings and confirm which issues were resolved and which remain. Set the next reminder using the manufacturer’s guidance and the technician’s assessment of usage and conditions, rather than assuming every household needs the same schedule.