General Assist Customer Support
Split System Is Running but Not Cooling
What to check when the indoor unit is blowing air but the room is not getting cold
Quick answer: If your split system is set to COOL but only blows room-temperature air, the indoor fan may be operating while the refrigeration system is not producing cooling. Start with the settings, airflow and power-reset checks below. If cooling does not return, service may be required.
1. Confirm the settings
- Set the air conditioner to COOL mode - usually shown by a snowflake icon. Do not use AUTO for this test.
- Set the temperature to 18-20°C.
- Set the indoor fan speed to HIGH.
- Allow the system 10-15 minutes to stabilise.
Why this matters: Testing in COOL mode at a low set temperature removes most normal control variables and makes it easier to confirm whether the refrigeration system is actually producing cooling.
2. Basic checks at home
| Check | What to look for |
|---|---|
| Filters | Clean dirty filters. Restricted airflow can reduce performance and may contribute to protection operation. |
| Outdoor unit | Check whether the outdoor unit appears to be operating normally, including fan operation and normal operating sound. |
| Icing | Look for ice on the indoor coil behind the filters or on exposed outdoor pipework. |
If you see significant ice: Turn the system off and arrange service. Continued operation while iced can worsen the condition and may cause water leakage when the ice melts.
3. Perform a safe reset
- Turn the air conditioner OFF using the remote controller.
- Turn power OFF at the air-conditioning isolator, switch or circuit for approximately 2 minutes.
- Restore power.
- Set the system back to COOL, 18-20°C and HIGH fan, then retest.
4. If it still does not cool
If the unit continues to blow room-temperature air after the checks above, a technician will generally need to inspect the system.
Possible cause: low refrigerant due to a leak
Refrigerant does not normally get "used up". If a system is low on refrigerant, there is usually a leak that should be located and repaired. Simply adding refrigerant without addressing the leak can result in the same fault returning.
Possible cause: outdoor unit or control fault
Electrical, inverter, compressor or control faults can prevent the outdoor unit from producing cooling even though the indoor fan continues to run.
5. What a technician will typically check
- Confirm system operation and cooling performance
- Measure relevant temperatures and operating pressures
- Carry out leak checks where indicated
- Repair any confirmed leak and recharge the system to specification where required
- Check the outdoor unit, electrical controls, inverter and compressor operation as applicable
- Verify correct cooling output before completion
6. Information to provide when contacting support
To help speed up diagnosis, provide:
- Model number from the indoor unit rating label
- Confirmation that the unit is set to COOL
- Whether the outdoor unit is operating
- Any flashing lights or displayed error codes
- A photo or short video showing the indoor display/indicator lights and the outdoor unit while the system is running
Safety: Do not open refrigeration components or attempt to add refrigerant yourself. Refrigerant handling and sealed-system work must be completed by an appropriately licensed technician.
Outcome: If correct COOL-mode settings, clean airflow paths and a power reset do not restore cooling, arrange service so the refrigeration circuit, outdoor unit and controls can be properly tested.
General Assist Customer Support