Heating and cooling

How to clean split-system air-conditioner filters

Dirty filters reduce airflow, increase running costs and can make a system freeze or leak. Cleaning the indoor unit's filters is routine maintenance most owners can do.

By Fixit247 Editorial TeamReviewed 28 September 20264 min read

Safety classification

Safe homeowner task

This guide covers safe first actions only. It is not a licence to perform regulated work or enter a dangerous area.

What to do

1
Turn the system off
Switch off with the remote and at the isolator or power point if accessible, so the fan cannot start while you work.
2
Open the front panel
Lift the front cover as described in your manual. Slide or unclip the mesh filters.
3
Vacuum and rinse
Vacuum dust off, then rinse in lukewarm water with mild detergent if needed. Do not use hot water or harsh chemicals.
4
Dry completely in the shade
Let the filters dry fully out of direct sun before refitting, so they do not warp or grow mould.
5
Refit and test
Refit the filters, close the panel and run the system. Many manufacturers suggest cleaning every few weeks during heavy use.