Category checklist · Melbourne
Air Conditioning Maintenance Checklist for Melbourne Homes
Melbourne's four-seasons-in-one-day climate means air conditioning units work harder than almost anywhere in Australia. Ducted systems and split systems both accumulate dust, mould, and reduced efficiency when not maintained — leading to higher power bills, poor indoor air quality, and eventual system failure. This checklist covers the key observations that reveal most common HVAC problems before they escalate, for both system types.
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- 1 Remove and inspect your split system's filter panel: heavy dust accumulation, discolouration, or visible mould growth are signs the system needs professional service.
- 2 Check your split system's indoor head unit for drainage issues — a blocked condensate drain line or overflowing drip tray will cause water to leak down the wall or pool on the floor beneath the unit.
- 3 Test your split system's remote or inverter controls: error codes on the display, the unit failing to respond to temperature changes, or unusually slow ramp-up all point to sensor or inverter board faults.
- 4 Run your ducted system and walk each room — uneven airflow, musty smells from vents, or rooms that fail to reach the set temperature all indicate blockages or system issues.
- 5 Listen for unusual noises during operation: rattling, grinding, or high-pitched sounds suggest loose components, debris in the unit, or failing motors — relevant for both split and ducted systems.
- 6 Check that your outdoor compressor/condenser unit (shared by both split and ducted systems) is clear of debris and vegetation, that the fan spins freely, and that fins are not visibly bent or blocked — restricted airflow reduces efficiency significantly.
Warning Signs to Look For
- Musty or mouldy smell when the system runs
- Visible black spots or discolouration on filter panels
- Reduced airflow from vents compared to previous seasons
- Water leaking or dripping internally from the split system's indoor head unit
- Error codes displayed on a split system's remote control or unit panel
- Condenser fan not spinning, or spinning much slower than usual, on the outdoor unit
- System running constantly without reaching set temperature
- Ice forming on refrigerant lines or the outdoor unit
Cost of ignoring
Neglected air conditioning systems can produce airborne mould spores that affect respiratory health, particularly for children and people with asthma. Efficiency losses from dirty filters and coils typically add 10–25% to running costs. Full ducted system replacement in Melbourne ranges from $8,000–$25,000, while a single split system unit typically costs $2,500–$6,000 to replace (or $150–$450 for a repair callout) — routine servicing every 1–2 years costs $150–$400 and prevents most premature failures for both system types.
Frequently Asked Questions
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How often should split systems and ducted systems be serviced in Melbourne?
Split systems should be serviced every 1–2 years. Ducted systems with gas heating components should be serviced annually by a licensed technician. Filter cleaning every 3–6 months can be done by homeowners for either system type.
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How much does it cost to repair or service a split system in Melbourne?
A standard split system service (filter clean, drain check, gas pressure test) typically costs $120–$250. Repairs such as a new drain pump, PC board, or refrigerant top-up range from $150–$800, while a full unit replacement generally runs $2,500–$6,000 installed, depending on capacity and brand.
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Is mould in an air conditioning unit dangerous?
Yes — mould spores circulated through either a ducted system or a split system's indoor head unit can affect the entire home's air quality. If you notice a musty smell or see visible mould near vents or the filter panel, book a professional clean promptly rather than continuing to run the system.
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Why is my air conditioner causing high electricity bills?
Common causes include dirty filters restricting airflow, refrigerant leaks reducing efficiency, aging compressors, and — for ducted systems specifically — poor duct insulation. On split systems, a dirty outdoor condenser or a failing inverter board can also spike running costs. A service technician can diagnose the cause — often a clean or refrigerant top-up resolves the issue.
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