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For Traders

Air conditioning problems

10 problems

Low risk

Air Conditioning Not Blowing Cold

The unit runs and the fan blows, but the air coming out is room temperature or barely cool.

Caution

Water Dripping From The Indoor Unit

Water is running down the wall below the indoor head, or dripping off its bottom edge onto the floor.

Caution

Musty Smell When The Air Conditioning Starts

A damp, sour or gym-bag smell fills the room for the first few minutes after the unit comes on.

Caution

Ice On The Pipework Or Indoor Unit

There is frost or solid ice on the copper pipes, on the coil behind the indoor grille, or on the outdoor unit's valves.

Caution

Error Code Or Flashing Light On The Unit

The indoor head is flashing its timer or operation lamp in a pattern, or the wall controller is showing a code like E4 or U0.

Caution

Outdoor Unit Not Running

The indoor head blows air and the lights are on, but the box outside is silent and its fan never turns.

Low risk

Rattling, Gurgling Or Vibrating Noise

The system has become noisy: a rattle from the indoor head, a drone or vibration from the unit outside, or gurgling in the pipework.

Caution

System Keeps Needing Regassing

Cooling fades after a few months, someone tops the gas up, and a season later it has faded again.

Low risk

Air Conditioning Not Heating In Winter

The system cools perfectly in summer but blows cold, or nothing at all, when you switch it to heat.

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