A Daikin Air Conditioner Troubleshooting Guide

Picture this: It’s a classic Australian summer and you count yourself lucky to escape the suffocating heat by turning your air con up full-volume. Refreshing cold air billows around you, lulling you into a gentle, relaxed state. Until suddenly your AC stops. The machine sputters and all serenity comes to a grinding stop. Now, the dreaded deluge of suffocating heat begins to creep in. You’re left drowning in a pool of your own sticky sweat..


Thankfully, our Daikin AC troubleshooting guide has come to the rescue. In this blog post, we tackle the most common questions we receive from clients when their air con just won’t seem to work, everything from ‘Why is my Daikin aircon not working?’ to ‘Is it possible to fix this air con problem myself?’

We offer easy tips on how to quickly fix almost any issue you can possibly think of and let you know when it’s not worth trying to MacGyver a solution yourself (read: dangerous).

Daikin Air Conditioner Troubleshooting Guide and Quick Solutions

You might be surprised to learn that if you’re having air con problems, you don’t necessarily need to call a technician out. Often, there’s an easy solution to get your air con up and working again.

If any of our suggestions below do not solve your problem, we recommend calling your authorised Daikin specialists at Crown Power for fast, affordable help.

My Daikin Aircon Is Not Cooling


Before you begin these tests, we recommend closing all windows and doors to the room you’re cooling so any cool air is sealed inside.

If you suspect your air conditioner is not creating cold air:

#1 Double check the temperature on your remote

Your remote will display a number in degrees Celsius. Here’s how to set temperature on a Daikin air conditioner:

Find your air con remote.
Press the up or down buttons on the remote to set your ideal cool temperature. The best temperature depends on the season and your location.
In 15 minutes, test that the room reaches the temperature you set using a thermometer.

#2 Check the air filters are clean

Our experts recommend cleaning your air con filters once every two weeks in summer (when it sees heavy use). Otherwise, it’s okay to wash your air-purifying filter once every six months.

Unsure how to clean your Daikin’s air filters? Don’t worry, it’s easy. Just follow the simple steps in our guide to maintaining your air conditioner.

#3 Check the air con is clear of obstructions

Check that the areas surrounding the air con aren’t blocked by furniture or decor items.

#4 Check that the sensor is working

If your Daikin aircon is not cooling your room as much as you expect, it may be a Daikin sensor problem. Why does this happen? The sensor may not detect people at locations far away from your indoor air con. Move closer to the air con and check that the air quantity and direction are properly controlled and that the ventilation fan is moving.

My Daikin Air Con Won’t Turn On


Wondering why your Daikin inverter isn’t turning on? Here are a few simple checks you can do to figure out what’s up and reset your Daikin air conditioner.

If the operation lamp is off, check that the fuse isn’t blown and that there isn’t a power failure. Make sure that the power cord is properly connected to the outlet. Double check the batteries in the remote itself and see if the timer has been set or not.

If the operation lamp is flashing (this looks like a green flashing light), unplug from power or turn off the circuit breaker. Waiting at least one minute, turn the power back on. If the operation lamp continues to flash, you may want to try contacting your retailer or calling an air conditioning expert for professional advice.

My Daikin Air Conditioner Has A Flashing Green Light


If you’ve noticed that your Daikin air conditioner has a flashing green light, don’t panic. While there are a few different issues that can be indicated by a blinking green light, most of them are pretty easy fixes.

Here are some steps to follow:

  1. First, slide off the cover of your remote.
  2. Locate the cancel button.
  3. Hold the cancel button down for five to ten seconds.
  4. Release when the temperature disappears from the screen and is replaced by two flashing zeros.
  5. As the zeros begin to flash, continually press the cancel button in time with the blinking.
  6. As you press the button, new two-digit figures will pop up. This is a list of all the possible faults that your air con is experiencing.
  7. If your air con beeps once on a number, it is not the right number for the fault.
  8. If your air con beeps twice, one of the two numbers are correct.
  9. If your air con emits a long continuous beep, both of the numbers are correct. This gives you the correct code to identify the issue.
  10. Look to your user manual now to find the malfunction code list. Match the letter to the number to find out what is wrong and contact your Daikin air con specialist.

My Daikin AC Remote Is Not Working


If your Daikin aircon remote isn’t working, first try to reset your Daikin remote or controller.

Here’s how to reset a Daikin air conditioner remote:

  1. Locate the ‘ON/OFF’ button on your Daikin air con’s remote.
  2. Press and hold the ‘ON/OFF’ button for 2 seconds and release.
  3. Press the ON/OFF switch once to stop operation.
  4. Press it a second time to start it again.

If this button on your remote or air conditioning unit is not working, this is unfortunately not a problem you can solve on your own. Turn off the power and contact the retailer who sold you the unit, or a professional air conditioning advisor like Crown Power.

My Daikin Heat Pump Won’t Turn On

If your Daikin air conditioner is not heating in summer, you may have:

  • A clogged filter
  • A refrigerant leak
  • Dirty coils that block heat transfer

The first issue you can fix yourself by cleaning your air conditioner’s filter. If you’re dealing with one of the second two issues, turn off your air con immediately to prevent further damage and call a reputable professional for assistance.

When it comes to Daikin heat pump troubleshooting in winter, here are some possible reasons:

  • Your unit is failing to defrost due to faulty relays, controls or sensors
  • There is an issue with the reverse valve that switches your unit from heat to cooling
  • Your outdoor fan is damaged, or the motor is failing or dead
  • Your heat pump is slowly leaking refrigerant

My Daikin Indoor Air Con Is Leaking


If water is leaking from your indoor air con, unplug all power and seek professional advice. It is common for air conditioning units to produce some condensation, but a major leak could be a major safety issue so do not approach it or attempt to fix it yourself.

My Daikin AC Keeps Switching Off Automatically

woman struggling in heat

If your air con turns on and off repeatedly, or stops unexpectedly, this is usually not worth worrying about. Unexpected stopping is not a malfunction. This is an operation to protect the unit if the voltage is fluctuating. You should find that normal operation occurs within about three minutes.

When the temperature in your room reaches the set level the unit switches to ‘breeze mode’ to make sure it doesn’t get too hot or too cold. Once the temperature fluctuates again, air flow volume will increase. Stable room temperature is the goal of a good unit, so our Daikin air conditioning troubleshooting guide recommends leaving this well alone!

My Daikin Zone Controller Is Not Working


If you have a ducted air conditioner and your Daikin zone controller is not working, we recommend contacting an air conditioning specialist immediately.

My Daikin’s Heating Stopped Unexpectedly And I Hear Water Flowing

If your heating stops unexpectedly and you hear the sound of water flowing, your system is in defrost operation on the outdoor unit. Please wait for about ten minutes.

My Daikin Air Conditioner Won’t Turn Off


If you’ve turned off the dehumidifier, dry cooling and cooling settings, yet your air con is still working, check your mould proof setting. If it’s ON, this is what has been activated and is keeping your air con on.

My Daikin Air Con Is Making A Noise


First identify what kind of sound it is making. Here are some possibilities:

  • Abnormal sound? Unplug power and contact the place you purchased the unit.
  • Clicking sound? The refrigerant control valve or electric component may be operating.
  • Buzzing sound? The flap is moving.
  • Rattling or creaking sound? This is the adjustment of the position of the flaps during operation startup.
  • Bubbling sound? This may be outdoor air entering the drain hose. Generally, this is normal and tends to happen in a well-sealed house or if you’re living in an apartment.
  • Soft rumbling sound? Check the ventilation mode. If it’s operating in ‘fan’ it will sometimes make this noise.
  • Hissing sound? This is the discharge of humidified or ventilated air. This can occur when it’s humid outside, or during other temperature extremes.
  • Abnormal sound when you’re cleaning the filter? Unplug power and contact a professional for advice.

My Daikin Air Con Is Making A Smell


If your air conditioning unit is producing unpleasant smells, the odour may be a sign of bigger problems.

If you smell something burning, switch off power immediately and contact a professional.

If the smell is unpleasant, it’s likely discharge that occurs during the purifying operation. It doesn’t pose a health hazard (though it isn’t very nice) and it will dissipate shortly. It is normal.

Please don’t apply cleaning spray or odour spray to your air conditioning unit at any stage. It’s not necessary and may cause damage that will void your warranty.

My Remote Control Display Won’t Work


Sounds like a case of flat batteries. Replace the batteries, and if the issue doesn’t improve, contact your distributor.

My Daikin Air Con Won’t Reach The Set Humidity Level

If the humidity goes below the set level or doesn’t reach the set level, here’s a simple fix. If your unit is operating in ‘humidifying heating’ mode, lower the setting for the temperature. If it’s in humidifying mode, increase humidity setting and select ‘Continuous’ operation.

My Outdoor Air Con Unit Is Releasing Water Or Steam

This could happen as a result of frost on the unit. The pipes on the outdoor unit can get quite cold if they’re in the cooling operation and this will produce condensation, causing water to drip down. This is usually nothing to worry about unless it causes other problems.

Crown Power are authorised Daikin air conditioning specialists. Need help with Daikin split system troubleshooting or Daikin ducted air conditioning troubleshooting? We’re happy to answer any and all of your questions. Contact Crown Power today on 0427 175 654 (Brisbane & Sunshine Coast) or 0421 376 620 (Gold Coast).