Over time, with regular use, even appliances of the highest quality in terms of construction and components can develop minor problems. Dealing with an air conditioner that isn't functioning properly can be particularly frustrating, especially during a sweltering summer day.

Guide to Fixing Problems with Your Daikin Air-Conditioner

1. Daikin AC Unit Won't Start

Typically, air conditioning systems consume a substantial amount of power to operate efficiently. Consequently, one of the most common reasons a Daikin air conditioner fails to start is due to a blown or tripped circuit breaker.To determine if this is the issue, inspect your switchboard for any tripped switches. If you find a tripped circuit breaker, you can reset it.

However, if it trips again, it's crucial to contact an air conditioning technician immediately and avoid using the system until it's professionally repaired. If the circuit breaker is fine but the AC still won't start or cool, you can attempt a 'hard' reset. This involves turning off the isolator switch located at the outdoor unit and leaving it off for at least 30 minutes.

Afterwards, turn the isolator back on and check if the air conditioner has reset and resumed normal operation. If this doesn't resolve the issue, it's advisable to consult a licensed air conditioning technician for diagnosis and repair.

2. Daikin AC Not Cooling

If your air conditioner isn't emitting cool air, it's essential to first inspect and clean the air filters. Air conditioner filters should be cleaned every 3-4 months or sooner in some cases. Neglecting this maintenance can lead to the accumulation of dust and debris, which can block airflow and impede your air conditioner's performance.

Some Daikin systems offer an 'auto filter cleaning setting,' but keep in mind that an AC unit may not immediately start cooling after a filter cleaning operation.Additionally, double-check the temperature and mode settings on your Daikin remote controller to ensure they are correctly configured.

Regular air conditioning servicing can help prevent dirty or clogged filters and detect potential issues before they escalate into major problems that could lead to system breakdowns.

3. Daikin AC Leaking

While a small amount of condensation is normal for a Daikin air conditioner, excessive moisture, such as dripping from the vents in a ducted system or from the indoor unit in a split system, indicates a problem. In such cases, it's advisable to turn off the unit and contact a professional technician to prevent further damage to the air conditioner and potential water damage to your walls and surroundings.

4. Daikin AC Displaying Error Codes

Daikin air conditioners feature both a green and an orange operation lamp to indicate specific issues to users.To diagnose the problem when the green light is displayed, you can remove the back cover of the remote controller and locate the cancel button.

Holding the cancel button for 5-10 seconds will replace the temperature display with two flashing zeros. Continue pressing the cancel button until you hear a long beep. Subsequently, the zeros on the screen will be replaced by numbers that correspond to specific issues.

One beep indicates an incorrect issue, two beeps mean that one of the numbers displayed is the correct issue, and a continuous long beep indicates that both numbers are correct. To troubleshoot the problem further, consult the Daikin air conditioner fault code page available online.

Pros and Cons of Daikin


  • Energy Efficiency
  • Advanced Technology
  • Reliability
  • Quiet Operation


  • Initial Cost
  • Installation Complexity
  • Limited Availability
  • Repair Costs

Differences Between Daikin and Miele


Daikin primarily specializes in heating, ventilation, and air conditioning (HVAC) systems. They are well-known for their air conditioning and climate control products, catering to both residential and commercial markets.


Miele is a German company known for its high-end domestic appliances, particularly in the areas of kitchen and laundry appliances. Their product range includes dishwashers, vacuum cleaners, washing machines, ovens, and more.

Alternative to Daikin

Mitsubishi Electric

Mitsubishi Electric is known for its high-quality ductless and ducted mini-split systems. They offer advanced technology and energy-efficient solutions for both residential and commercial applications.

1. Daikin Air Conditioner Remote Malfunction

If your Daikin air conditioner remote isn't functioning correctly, you can attempt to reset it by holding the on/off button for two seconds. Press the on/off switch once to stop the operation and a second time to restart the remote.

If the remote controller display is blank or faded, consider replacing the batteries and then performing the aforementioned reset.

2. Daikin AC Excessive Noise

Unusual sounds from your Daikin air conditioner unit should prompt you to turn it off and schedule a service technician to inspect the system.

3. Daikin AC Unpleasant Odor

If your Daikin air conditioner emits a foul odour, ensure that the filter has been recently replaced. Various factors, from dead insects inside the unit to mechanical problems, can cause unpleasant smells in an AC. For a more comprehensive list of causes and remedies for foul-smelling AC units, refer to our guide. Often, a deep cleaning is necessary when an air conditioner emits a bad odour, in addition to regular servicing.

4. Daikin AC Doesn't Turn Off

If your Daikin air conditioner remains on continuously, it could be due to a dirty filter preventing the room from reaching the desired temperature, incorrect settings, or a power interruption. Start by checking that features such as dry cooling, dehumidification, cooling, and mould prevention are all turned off.

There are several reasons why your system may not shut off, most of which are related to it not reaching the desired temperature. For a more comprehensive list of causes and solutions for a Daikin AC that won't turn off, consult our guide.

Daikin Air Conditioner fault codes

Fault Code Fault Explanation Possible Causes Origin of Fault
A0 External protection device activated External protection device connected to the terminal strip T1-T2 of indoor unit is activated Indoor unit
A1 Malfunction of indoor unit PCB Defective indoor unit PCB. External factors (noise etc.) Indoor unit
A3 Drain Level Control System Abnormality Drain clogging, upward slope, etc. Defective drain pump Defective float switch or short circuit connector Indoor unit
A4 Malfunction of freezing protection Shortage of water volume Low water temperature setting Defective water temperature thermistor Indoor unit
A5 High-pressure control in heating, freeze-up protection control in cooling The clogged air filter of the indoor unit and short circuit Defect of the indoor unit heat ex Indoor unit



Daikin troubleshooting is a crucial process for identifying and addressing various issues that may arise with Daikin air conditioning units. By understanding the fault codes and their explanations, as well as the possible causes and origins of faults, users and technicians can effectively diagnose and resolve problems with these systems.

Whether it's dealing with issues related to external protection devices, PCB malfunctions, drainage problems, freezing protection, or pressure control, a systematic approach to troubleshooting is essential for maintaining the optimal performance and efficiency of Daikin air conditioners.

Regular maintenance and prompt attention to faults can help ensure that your Daikin unit continues to provide reliable cooling and heating when you need it most.

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My name is Wisdom Bassey, I'm a blog content writer and graphic designer who provides support and services for brands and different companies. I'm young and versatile, A tech enthusiast. I carry out deep research on every topic I choose to write about. You can reach me through my social media handles, I'm always available and ready to connect.

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