Blowing air, but the air isn't cold
Refrigerant is the usual culprit — and an aircon doesn't consume gas, so if it's low, it's leaking. The second suspect is the capacitor, a component that gives the compressor the kick it needs to start. A failed one leaves the fan spinning happily while the compressor never engages. The third is airflow: a coil buried under a season's worth of dust simply cannot transfer heat.
Water running down the wall
A split unit produces a surprising amount of condensate, and it all leaves through one small drain line. Dust and algae build up inside that pipe, the water backs up into the drip tray, the tray overflows, and it runs into your room. It's one of the cheapest repairs we do — and one of the most expensive to ignore, because ceilings and skirting don't recover.
Noise that wasn't there before
A rattle is usually a loose cover or a fan blade catching. A grinding or screeching noise is a bearing in the fan motor. A hiss can be gas escaping. A hum with no start is very often the capacitor again. Noise is diagnostic — record it on your phone if you can, because faults love to go quiet the moment a technician walks in.
It trips the DB board
Repeatedly resetting a tripping circuit is the worst thing you can do. Tripping is an electrical fault announcing itself — a shorted compressor winding, a failing capacitor, or genuine earth leakage. Switch it off at the isolator and phone us before you damage something more expensive.