Start With a Safe Switch-Off and a Dry Workspace
Before you touch anything, switch the unit off at the remote and then at the isolator or breaker if you can reach it safely. Wait a few minutes for the indoor unit to stop completely, then open windows for light and fresh air. In Mbombela and White River, where humidity can be high for much of the year, it is worth making sure the filter is fully dry before it goes back in, otherwise you can end up with a musty smell.
Lay a towel under the unit if the cover is above a bed, sofa or floor covering. That keeps dust and drips off the room. If the unit is mounted high on the wall and you need a step ladder, make sure it stands level and someone is nearby. A small slip here can turn a 10 minute job into a repair call.
Remove the Front Cover and Lift Out the Filters Gently
Most wall split units have a front cover that lifts up from the bottom. Open it slowly and look for two mesh filters behind the front grille. They usually slide up and out on small tabs or handles. Do not force them. If they stick, check that you are lifting the right side first, because some units have one filter that catches slightly before the other.
Keep track of how they sit in the frame. The filters need to go back the same way so the air passes through cleanly. In homes near busy roads around Klerksdorp or Potchefstroom, filters can collect fine dust quite fast, so a monthly check is a good habit during dry, windy weeks.
- Open the cover slowly so the clips do not snap.
- Pull the filters straight out, not sideways.
- Place them on a clean table or on cardboard.
- Check for bent mesh, broken tabs or heavy damage before washing.
Vacuum First, Then Wash With Lukewarm Water
Take the filters outside and give them a light vacuum on the dust side first. This removes loose dirt and stops mud forming when water is added. After that, rinse them with lukewarm water. A little mild dish soap is enough if the mesh is greasy or sticky, especially in kitchens or open-plan living areas. Do not use hot water, bleach or strong chemicals because they can warp the plastic frame and leave a smell in the room.
Use your hand or a soft cloth to wipe along the mesh. Work from top to bottom. If there is heavy dust from a recent dry spell in Rustenburg or a construction area in Hazyview, you may need a second rinse. Never scrub hard with a stiff brush, because the mesh tears easier than people think.
- Rinse from the clean side back towards the dirty side.
- Use only mild soap if needed.
- Avoid pressure sprays on the mesh.
- Check corners where dust usually gathers first.
Let the Filters Dry Fully Before Refitting Them
After washing, shake off the excess water and leave the filters in a shaded, airy place. Direct sun can make the plastic brittle over time, so a covered stoep, laundry line or garage shelf is better. They should be completely dry before you reinstall them. If you rush this step, moisture can collect inside the unit and lead to smell, mould growth or a damp patch around the indoor cover.
In the Lowveld, where warm air can dry parts quickly but humidity still hangs around after rain, give the filters extra time if needed. A simple rule is this: if they still feel cool or damp to the touch, leave them out longer. It is a small wait, but it saves trouble later.
Reinstall the Filters and Check the Airflow
Slide the dry filters back into their tracks or slots in the same direction they came out. Make sure they sit flat and do not bow in the middle. Close the front cover carefully until it clicks shut. Once the unit is on again, check that air is flowing evenly and that there is no rattle from the cover. If the airflow still feels weak after the filters are clean, the issue may be deeper in the coil, fan or drainage path.
This is where many homeowners stop, and that is fine for routine care. But if the unit still smells dusty, trips on startup or blows warmer air than it should, then the problem is not just the filter. In those cases a technician should inspect the system before small dirt issues turn into a bigger service call.
- Confirm the cover closes fully on both sides.
- Run the unit on fan mode for a few minutes.
- Listen for new rattles or loose plastic sounds.
- Check that the airflow is stronger than before cleaning.
Set a Cleaning Routine That Matches Your Home
How often you clean depends on where the unit runs and how much dust the room collects. A home in central Mbombela with open windows near a busy street may need filter cleaning every two to four weeks. A quieter bedroom or office can usually go longer. Coastal style humidity is not the issue in the Lowveld alone, because dust, pollen and fine building debris can load the filter just as fast. In Klerksdorp and the wider North West, dry weather and open yards often mean more dust on the mesh than people expect.
Use the first weekend of each month as a reminder, or clean the filters when you notice reduced air flow, more noise or a slight smell when the unit starts. If the unit is used hard during load shedding recovery, or in rooms with pets, add an extra check. A washable filter only works well when you keep on top of it, not once a year when the season changes.
- Every 2 to 4 weeks in dusty or high use rooms.
- Monthly in normal home use.
- More often if you have pets, pollen or nearby building work.
- Book full servicing if smell, weak cooling or water leaks continue.
Know When to Stop and Call for Proper Service
Filter cleaning is a homeowner task, but it does not replace scheduled servicing. If the indoor unit has water dripping from the corners, ice on the pipes, a burning smell, or black marks around the outlet, stop and get the system checked. These signs can point to blocked drainage, poor gas charge, fan issues or dirt deeper inside the unit. Trying to fix that with a quick rinse will only hide the problem for a short while.
For homes and small businesses in Mbombela, White River, Hazyview, Klerksdorp, Potchefstroom and Rustenburg, proper support matters because site conditions differ from one area to the next. A neat filter helps, but the rest of the system still needs the right inspection, cleaning and commissioning when required. That is the part many people miss, and it usually shows up at the worst time, like the first hot week of summer.
