What You Can Do: The Homeowner Maintenance Checklist

• Clean or replace the filters every four to six weeks during heavy use: Filters capture dust, pollen, and airborne particles before they circulate through your home. When they become clogged, the system has to work harder to move air, increasing energy consumption and reducing cooling performance. Most split system filters can be removed, washed under running water, dried completely, and reinstalled. Disposable filters should be replaced according to the manufacturer's recommendations.
• Keep the outdoor unit clear: The outdoor compressor needs adequate airflow to release heat efficiently. Regularly remove leaves, dirt, grass clippings, cobwebs, and anything stored close to the unit. Maintain at least 300mm of clearance around the system and trim back any nearby vegetation.
• Wipe down the indoor unit: Dust can build up on the louvres, vents, and exterior casing. Use a soft, damp cloth to clean these surfaces, but avoid spraying water or cleaning products directly into the unit, as moisture may damage internal electrical components.
• Check the condensate drain: Air conditioners remove moisture from the air, which drains outside through a condensate pipe. If this pipe becomes blocked by algae, dust, or insect debris, water may back up and leak from the indoor unit. Dripping water or stains near the unit are signs that the drain may need attention.
• Listen for unusual noises: A properly operating air conditioner should produce a steady, low sound. Rattling, clicking, grinding, or buzzing may indicate loose components, debris, or a developing motor fault. Investigating these noises early can prevent more expensive damage.

When to Call a Professional

While regular homeowner maintenance covers the basics, a professional service inspects the components that affect long-term performance, safety, and system reliability. Your air conditioner should generally be serviced by a qualified technician at least once a year, ideally before the start of Brisbane's summer season.

A professional air conditioning service typically includes:

• Refrigerant level check: Low refrigerant can significantly reduce cooling performance and usually indicates a leak. The leak must be identified and repaired before the refrigerant is recharged. Refrigerant can only be handled by technicians holding an Australian Refrigeration Council Refrigerant Handling Licence.
• Evaporator and condenser coil cleaning: Dirt and grime gradually build up on the coils that transfer heat between the refrigerant and the surrounding air. Professional cleaning restores efficient heat exchange and can improve cooling output.
• Electrical inspection: Electrical connections, terminals, contactors, wiring, and capacitors are checked for corrosion, wear, looseness, or signs of overheating. These issues are common causes of intermittent operation and complete system failure.
• Fan and motor inspection: The indoor and outdoor fans are inspected for balance, bearing wear, and general condition. Worn or unbalanced fan components can create excessive noise, vibration, and eventual mechanical failure.
• Thermostat calibration: If the room temperature does not match the temperature selected on the controller, the thermostat or sensor may require adjustment. An inaccurate sensor can cause the system to run for too long or switch off before the room is comfortable.
• Overall performance testing: The technician runs the system through its operating modes, measures temperature differences between supply and return air, and confirms that the unit is operating within the manufacturer's specifications.

Warning Signs Your System Needs Attention

Between scheduled services, watch for changes in performance that may indicate your air conditioner needs professional attention.

• Reduced airflow: Weak airflow from the indoor unit is often caused by dirty filters. If the filters are clean, the problem may involve the fan motor or a blockage within the ductwork.
• The room is not reaching the selected temperature: This may indicate low refrigerant, dirty coils, poor airflow, or a developing compressor fault.
• Ice forming on the indoor unit or refrigerant lines: Ice formation can be caused by restricted airflow or low refrigerant. Turn the unit off and arrange an inspection.
• Water leaking from the indoor unit: This is commonly caused by a blocked condensate drain, although it may also occur when a frozen evaporator coil begins to thaw.
• Unusual smells: Musty or mouldy smells may indicate microbial growth inside the unit or ductwork. A burning smell may point to an electrical fault and should be treated seriously. Turn the system off and contact a qualified technician.
• Higher electricity bills: A noticeable increase in energy use without a change in your operating habits may indicate that the system is working harder because of dirty filters, blocked coils, low refrigerant, or another efficiency problem.

How Maintenance Saves You Money

The cost of an annual professional service is significantly lower than the cost of a major repair or premature air conditioner replacement. A properly maintained split system may provide reliable service for 15 to 20 years, while a neglected system may fail much earlier.

Clean filters, clear airflow, and well-maintained coils allow the system to reach the selected temperature without operating under unnecessary strain. This can reduce electricity consumption, improve comfort, and minimise wear on compressors, fans, and other major components.

Regular maintenance may also help protect your manufacturer's warranty. Many manufacturers require evidence that the system has been professionally serviced, particularly where a fault may have been caused or worsened by poor maintenance.

Book an Air Conditioning Maintenance Service

At Algester Electrical, our ARC-licensed technicians service split system and ducted air conditioners for homes and businesses across Brisbane and South East Queensland. We carry out system inspections, filter and coil cleaning, refrigerant checks, electrical testing, and performance assessments to help keep your air conditioner operating safely and efficiently.

As Accredited Master Electricians, we can also diagnose and complete any electrical repairs identified during the service.

Book an air conditioning maintenance service or call us on 07 3273 1858 to arrange your pre-summer system check.