You turn on your reverse cycle air conditioner, but it is refusing to blow warm air. Now what? Thankfully, there are ways you can get it working; however, you need to figure out the cause!
When was the last time you had your heater serviced? Neglecting your climate system can lead to system failure, and nobody wants that.
This article is your best guide to Daikin air conditioning troubleshooting and how you can stay cosy during cold nights.

Let’s take a look at some of the potential heating issues with your unit. You might be able to narrow down what you need to do.
If air filters or coils become blocked, this restriction of airflow affects the heating and cooling capacity of your Daikin system. Regular maintenance, such as coil cleaning and filter replacements, will keep the hot air coming.
The refrigerant is a liquid that helps the air conditioner transfer heat. If these levels are low, the Daikin air con won’t be able to transfer heat and can stop the heat mode from working.
How do you fix this problem? HVAC technicians can re-gas your air conditioner to top up the refrigerant levels.
Allowing your system to switch from cooling to heating mode, a faulty one will mess with the heating. This issue is too dangerous to DIY, so make sure to reach out to a qualified HVAC technician.
What do your temperature settings look like? If they are set wrong, your Daikin aircon will expel cold air instead of hot air.
If you aren’t sure about the settings or need help with the programming, reach out to a qualified technician to guide you through the steps.
Never ignore the unit outside. Responsible for the transfer of heat from the inside of your home to the outside, if it becomes dirty, the heat mode is pretty much non-existent.
Sometimes, the heating mode of your Daikin air conditioner won’t work due to the frost cycle.
Preventing ice from building up in the outdoor unit, the defrost process is where the indoor unit blows cold air in order to heat up the outdoor unit. When this cycle is broken, your system won’t heat your home.
Without a thermostat, your system won’t work at all. If a thermostat isn’t working properly, it won’t send the correct signals to the air conditioner, which can lead to problems with the heat mode.
Malfunctioning circuit breakers or defective fuses are other reasons your Daikin system is blowing cold air!
Circuit trips or damaged fuses stop your heating system from reaching the desired heating temperature you want.
Warm air does not flow after starting the heating operation. This isn’t your air conditioner malfunctioning, the aircon is just warming up! Wait about 3 minutes.
Aircon still operates even when dehumidifying, dry cooling, or cooling options are off? Check if the mould-proof automatic setting is set to on. If the setting is on, mould-proof operation is activated after dehumidifying.
The heating operation stops unexpectedly, and you hear water flowing? This is not the air conditioning system malfunctioning; the system is in defrost operation on the outdoor unit. Aim for around 3 to 10 minutes.

As well as cold air instead of warm air being frustrating, there are other problems you might cross paths with. Here’s what to do.
If your Daikin inverter isn’t turning on, there are a few things you can do to reset the aircon. Is the on/off button off?
Is there an operation lamp flashing (the green flashing light)?
What are some dedicated locations of the breaker for the air conditioner? The breaker for the air conditioner is in the main fuse box, but if you’re unsure on where it is, check with your aircon installer or a qualified electrician.
How do you know when it’s working? The operation light is flashing again, or the air con operates, but the air con lamp starts flashing again. If the operator light is flashing, it’s likely that your system is malfunctioning.
Note: turning off the main breaker will turn off all power to your property. Do not turn off the main breaker!
If the monitor’s bright setting in the settings menu is set to OFF, the operation lamp does not light even during operation.
Don’t worry! The unit discharges cold air quickly to reduce humidity.
Check the following things before contacting your service provider:
This is not a malfunction of the air conditioner. When the ON timer is set, operation starts up to 1 hour before the time set to reach the set point.
If the remote controller is operated during this time, the operation automatically stops. Restart the operation after using the remote.
Stop operation, unplug the power cord or turn off the circuit breaker and contact the place of purchase.
Check the following before calling up an HVAC service:
This is not a malfunction of the air conditioning system; this function protects the air conditioner. Please wait for around 3 minutes.
Calling up a professional is great, but it’s a good idea to know how to maintain your Daikin system yourself throughout the year.
Cleaning and maintaining the air filters is the minimum requirement. Any buildup of dust or dirt restricts airflow and cuts back the energy efficiency and heating capacity of your system.
If the air conditioner is installed correctly, regassing won’t be necessary. That said, if the pipe connections are not fitted, tightened to the right torque, or have degraded over a period of time, there could be a leak. If you do suspect a gas leak, reach out to an HVAC professional ASAP.
Every 2 weeks. Wash them with water or clean them with a vacuum cleaner. If you’re dealing with heavy soiling, wash the filters with a neutral detergent diluted with tepid water and let the filter dry out in a shady place.
Look at the Daikin Cora split system, which is wall-mounted.

The Cora series has a whisper-quiet operation, superior comfort, and industry-leading energy efficiency. Features include:
Learn more about maintenance by reading our article: Why Autumn is the Best Time for Heater Servicing and Repairs.
Australian Climate Systems wants you to stay warm during winter! Operating in Melbourne for over 25 years, our locally-owned and run business specialises in sales and installation, service, maintenance and repair, and warranty repairs for heating and cooling solutions. Fully qualified and trained, we offer a 6-year workmanship guarantee.
Whether you’d like assistance with gas ducted heating repairs, ducted reverse cycle heating and cooling, electric heating and cooling or split systems, Aust Climate has a range of specials and new season products.
Contact us today on 03 9726 4444, email admin@austclimate.com.au, or visit us in person in Chirnside Park, Victoria.
And if you’re keen to upgrade your old gas heating system to electric, we can help you apply for the VEU Rebate!