Common aircon problems

Aircon running but not cold? Tell blocked airflow, a refrigerant leak, compressor faults and room heat load apart by how cooling fades.

Aircon leaking water indoors? Tell a blocked drain from a freezing coil or sagging piping by whether the drip is steady, bursts, or moves.

Aircon won't turn on? Use what happens at startup to separate a broken supply, a lost handshake, a board lockout, and a dead start circuit.

Aircon turning off mid-cycle? Use the shutdown pattern to separate heat overload, coil freezing, short cycling, and unstable controls.

Aircon light flashing? Separate a safety-circuit trip, an indoor-outdoor signal fault, and a drifting sensor by blink pattern and runtime.

Outdoor unit noisy at night? The noise pattern tells you whether it is vibration transfer, fan bearing wear, or compressor strain.

Aircon smells musty, sour, or burnt? Diagnose whether it's drain tray mould, deep coil buildup, or overheating wiring, and the urgency.

Breaker trips on startup? The trip timing, immediate versus after a brief hum, separates current leak, startup overcurrent, and heat damage.

Burning smell from your aircon? Learn when it points to wiring heat, motor strain, or PCB trouble, and what to check before calling.

One room stays warm while others cool fine? Tell a clogged unit, an indoor-unit fault, and a room heat-load problem apart by what you see.

Ice on your aircon pipe is real and fixable. Separate restricted airflow from a refrigerant leak by vent strength and where the ice sits.

Weak aircon airflow can be a clogged filter, a slowing fan motor, or ice on the coil. Use when and how it dropped to tell which one.

Indoor unit on, outdoor unit silent? Use the startup behaviour to separate a mode condition, a start-circuit fault, and a protection lockout.

Aircon cold then warm? Tell a coil freeze-up from sensor drift or an outdoor unit dropping out by how cooling fades and what you hear.

Indoor unit on but no air? Tell a startup fan delay from a fan or PCB failure or frozen-coil protection by when the fan actually stopped.

Indoor unit getting loud? Use the sound type and timing to separate panel vibration, fan or blower wear, and drain or freeze-related water noise.

Aircon not cold after servicing? Tell weak airflow from a pre-existing fault or a post-service setup slip. The vent breeze is the first clue.

Aircon remote not working? Use the response pattern to tell a dead remote signal from a failed receiver or a command that cooling ignores.

Water dripping from your outdoor aircon pipe? Where it drips tells you the fault: outlet drip is by design, pipe-body drip is not.

Aircon louvre stuck while cooling still works? Tell a swing motor fault, linkage jam, and control signal apart by sound and stop point.

Fan stuck on one speed? Tell a dead command path from inverter mode logic from a fan drive fault by what the remote shows and you hear.

Aircon clicking? A single startup click is normal, repeated clicking points to a louvre stall, and rapid clicking signals a chattering relay.

Aircon vibrating or buzzing through the wall? Tell loose mounting, fan imbalance, and compressor strain apart by how it tracks fan speed.

Water droplets on aircon pipes or trunking? Learn when pipe sweating is normal and when it points to insulation, airflow, or cooling faults.

Aircon beeping randomly? Stray IR signals, protective lockout codes, and board faults all beep. Read the pattern to know which one.

Aircon trips only when several units run together? Tell circuit overload, a weak outdoor startup part, and earth-leakage apart by speed.

App commands do nothing? Separate a network or cloud drop, a WiFi adapter dropping the link, and a unit that takes the command but won't cool.

Aircon smell persists after cleaning? Understand external odor, deep contamination, and urgent electrical smell patterns.

Room sticky even with aircon cooling? Tell apart external moisture load, short run cycles, and a fouled coil by how the damp behaves.

Aircon leaks only when it rains? Separate wall ingress, weather-pressure drain backflow, and rainwater near electrical points by timing.

One indoor unit trips the whole multi-split? Separate a local motor or board short, a humidity-driven insulation fault, and arc damage.

Outdoor fan spins but the room stays warm? Separate a compressor that won't load, gradual refrigerant loss, and a partial start command.

Aircon rebooting after a power dip? Use the restart pattern to separate normal auto-resume, an unstable supply, and a weakened board.

Gurgling noise from your aircon? Separate harmless drain flow sounds from refrigerant path faults or water backup by the cooling trend.

Aircon hissing? Separate normal expansion noise, a refrigerant leak, and electrical arcing by timing, cooling trend, smell, and breaker.

Mist from your aircon? How long it lasts and whether cooling drops tells you if it's startup condensation, airflow imbalance, or coil icing.

Aircon slow to cool? Separate high room heat load, restricted airflow, and weakening system output by when it worsens and what stays normal.

Cools at night but not the afternoon? Use the weekly trend to separate peak heat load from condenser fouling and compressor stress.

Fan keeps running after turning off? Separate the normal drying delay, a sticky fan relay, and an unstable mains supply by the pattern.

One side cold, the other warm? The pattern separates airflow direction, a stuck louvre or fouled blower, and a whole-room output drop.

Aircon outdoor unit too hot to touch? Use the cooling pattern to tell normal heat rejection from condenser fouling or compressor overload stress.

Cooling drops when two rooms run? Tell load sharing, flow imbalance, and a fading compressor apart by how fast one room recovers.

Aircon smell or weaker airflow right after a haze spell? Whether it is settled filter dust, a deeper coil issue, or something else.

Water on your aircon trunking can mean pipe sweat, a cracked drain fitting, or a shifted drain slope. Which sign points to which cause.