Why Is My Split System Air Conditioner Running but Not Cooling?

Your split system is switched on, but the room still feels warm. The indoor unit may be blowing air that feels warm, producing only a weak airflow, or cooling for a while before stopping. What you notice can help a technician understand what’s going on.

Start by checking that the system is set to Cool mode, usually shown with a snowflake symbol, and that the set temperature is below the room temperature. In Fan mode, the indoor unit circulates air without cooling it.

The air is flowing, but it feels warm

After selecting Cool mode, give the system a few minutes to respond. Some models take a short time to begin cooling.

If the air continues to feel warm, check whether the controller displays an error code. If you can safely see the outdoor unit, note whether it appears to be running. If the settings are correct and the system still isn’t cooling, arrange an inspection.

The airflow feels weaker than usual

A dirty filter can restrict airflow through the indoor unit. Check the filter according to the manufacturer’s instructions and clean it if needed. Make sure it is fully dry before reinstalling it.

If the filter is clean but the airflow remains weak, or the unit is making unusual noises, contact a technician for an inspection.

The unit cools for a while, then stops

A split system may slow down or switch off after the room reaches the set temperature. If the room is still warm when cooling stops, check whether a timer or schedule is active.

Note how long the unit runs before stopping and whether the indoor fan continues to blow. If the problem happens repeatedly, share those details when you book a repair.

There’s water around the indoor unit

A small amount of condensation can be part of normal operation, but water dripping from the indoor unit or running down the wall needs attention. Switch the system off if water is leaking and arrange a professional inspection.

What to tell us when you book

When you contact Morphett Air, let us know:

• The make or model of the split system, if you know it
• Whether the air feels warm or the airflow is weak
• Whether the system stops after running for a while
• Whether there is water, an unusual smell or an error code
• When the problem started and how often it happens

For basic checks such as filters and controller settings, see our eight-point summer air conditioning checklist⁠.

If your split system is running but the room still isn’t cooling, call Morphett Air on 08 8277 0511 to arrange an inspection in Adelaide.

When it’s too hot or cold to bare, reach for the Morphett Air!