7 Common Air Conditioner Problems in Brisbane (& Fixes)
Installer’s guide to the seven faults Brisbane homeowners ring us about most — what’s causing each symptom, what you can check yourself, and what the repair costs.
Quick answer: The big seven are (1) blowing warm not cold, (2) water dripping inside, (3) unit won’t start, (4) ice on indoor coil, (5) loud outdoor unit, (6) musty smell, (7) error code on display. Most are $140–$450 fixes; some are free DIY.
1. Blowing warm air not cold
Cause: Low refrigerant (slow leak most likely), failed capacitor, dirty outdoor coil, or compressor failure.
Fix: Diagnostic from $150. Capacitor from $140. Leak + regas from $550. Compressor from $1,200.
2. Water dripping inside
Cause: Blocked drain pan / line. Universal Brisbane issue.
DIY: Wet/dry vacuum on outdoor drain outlet for 30 seconds.
Pro fix: Drain flush as part of annual service from $149.
3. Unit won’t start
Cause: Tripped breaker, dead remote, failed capacitor, PCB failure.
DIY: Reset breaker (once). Fresh remote batteries. Test remote with phone camera.
Pro fix: Capacitor $140, PCB from $350. See PCB replacement.
4. Ice on indoor coil or refrigerant pipe
Cause: Low refrigerant or restricted airflow (filter blocked).
Stop using: Running iced unit damages compressor. Switch off.
Fix: Filter clean + leak diagnostic. Leak repair from $300 + regas from $250.
5. Loud outdoor unit (grinding, rattling)
Cause: Outdoor fan motor bearings dry from years of Brisbane heat.
Fix: Replace outdoor fan motor from $320 fully fitted with genuine OEM part.
6. Musty smell when AC starts
Cause: Mould on indoor coil and in drain pan. Brisbane humidity grows biofilm in 8–12 months without service.
Fix: Annual service ($149) catches this early. Heavily affected units need chemical cleaning from $249.
7. Error code on display
Cause: Brand-specific — usually communication, sensor, or PCB fault. Common: Daikin U3/U4, Mitsubishi P5, Panasonic H97, Fujitsu 12:01.
DIY: Power cycle (off at wall, wait 5 min, restart) clears 30% of intermittent codes.
Pro fix: Diagnostic from $150 identifies which. Most fixes $180–$450.
Brisbane repair pricing summary
| Repair | Starting from (inc GST) |
|---|---|
| Diagnostic (absorbed) | From $150 |
| Annual service / drain flush | From $149 |
| Capacitor | From $140 |
| Outdoor fan motor | From $320 |
| Indoor PCB | From $350 |
| Outdoor PCB | From $450 |
| Chemical cleaning | From $249 |
| Leak repair + regas | From $550 |
Common questions
Why is my AC blowing warm air?
Most likely low refrigerant (leak), failed capacitor, dirty outdoor coil, or compressor failure. Diagnostic from $150.
Why is water dripping from my indoor unit?
Blocked drain pan/line. DIY: wet/dry vac the outdoor drain outlet. Pro: drain flush ($149 with annual service).
Why won’t my AC start?
Tripped breaker, dead remote, failed capacitor, or PCB failure. Diagnostic from $150 to identify.
Why is there ice on my indoor coil?
Low refrigerant or blocked filter. Stop using and book a diagnostic — running iced damages the compressor.
Why does my AC smell musty?
Mould on the indoor coil from Brisbane humidity. Annual service prevents; chemical clean restores.
How much does AC repair cost in Brisbane?
Most repairs $140–$480. Diagnostic from $150 (absorbed into repair). PCB $350–$450. Outdoor fan motor $320. Leak repair + regas $550.
AH Air Conditioning · 63 Britannia Ave, Morningside QLD 4170 · ARCtick licensed · 20+ years across Brisbane.