Daikin AC Troubleshooting Guide
Daikin AC Remote Control Guide
Press the ON/OFF button once to start the AC and again to stop it.
Use the temperature buttons to increase or decrease the set temperature.
Press the MODE button to select the available mode, such as COOL, DRY, FAN, AUTO or HEAT, depending on your AC model.
Press the FAN button to select the available fan speed, such as Low, Medium, High or Auto.
Use the SWING button to adjust the airflow direction. Avoid moving the swing mechanism manually.
It increases the fan speed to provide faster cooling or heating. This function may vary by model.
It limits the AC's maximum power consumption to support more efficient operation.
Press the SLEEP button to enable or disable the Sleep function.
Press the CLOCK button and set the current day and time using the remote-control buttons.
Press the ON Timer button, choose the required time and confirm the setting.
Press the OFF Timer button, select the required time and confirm it.
Check that the AC's internal clock is set to the correct time. The timer may also need to be reset after a power failure or battery replacement.
The batteries may be weak. Replace both batteries with new AAA/LR03 batteries.
Open the battery cover, insert two AAA/LR03 batteries in the correct position and close the cover.
Batteries generally last about one year, but replace them sooner if the display becomes faint or reception becomes poor.
Point the remote directly toward the indoor unit and make sure there are no obstructions between the remote and the AC.
Some electronic-starter fluorescent lights can interfere with remote-control communication.
Keep the remote away from direct sunlight and wipe dust from the signal transmitter and receiver with a soft cloth.
Yes. Remove the batteries during extended periods when the AC will not be used.
Note: Remote-control buttons and available functions can vary depending on the Daikin AC model.
Back to guide sectionsDaikin AC Modes
Available modes and functions vary by Daikin AC model. Some models may be cooling-only, while others support heating.
Depending on the model, the available modes are AUTO, COOL, DRY, HEAT and FAN.
Press the MODE button to cycle through the available operating modes.
Yes. After operation is stopped, the AC uses the same operating mode the next time it is started.
COOL mode removes heat from the room to lower the room temperature.
The specified range is 18°C to 32°C for the models covered here.
Cooling performance can decrease when the outdoor temperature is high.
DRY mode reduces room humidity while trying to maintain the temperature as much as possible.
No. Fan speed is automatically controlled in DRY mode.
The temperature setting is not manually applicable in the models covered by the operating table.
HEAT mode warms the room by bringing heat from the outdoor air indoors.
The specified range is 10°C to 30°C for the models covered here.
The system needs time to warm up before the indoor unit starts delivering warm air.
The outdoor unit may enter defrosting operation when frost forms. Warm air may temporarily stop during this process.
AUTO mode automatically selects COOL or HEAT according to the room and outdoor temperatures.
No. The system can automatically reselect the operating mode at intervals to maintain the set room temperature.
The specified range is 18°C to 30°C for the models covered here.
FAN mode operates the indoor fan without cooling or heating the room.
Yes. Available fan speeds can include Low, Medium, High, Auto and Quiet, depending on the model.
ECONO is available with AUTO, COOL, DRY and HEAT operation.
No. It is available in COOL, HEAT and AUTO, but not in FAN or DRY mode.
Powerful operation is available for COOL and HEAT operation on supported models.
The AC automatically controls the fan speed in DRY mode to manage room humidity.
AC Filter Cleaning
Clean the air filter once every 2 weeks.
Open the front panel, remove the air filter, then vacuum the dust or wash the filter with water.
Yes. The air filter can be washed with water.
Use a neutral detergent diluted with lukewarm water, then dry the filter in the shade.
The filter should be dried in the shade after washing.
Yes. Dirty filters can result in poor heating or cooling performance.
Yes. Dirty air-purifying filters may cause odour.
Yes. A dirty air-purifying filter may not clean or deodorize the air effectively.
Air-filter dirt or a drain blockage can contribute to dripping under certain conditions.
Yes. Stop the AC and turn off the circuit breaker before cleaning.
Do not use water hotter than 40°C.
No. Avoid scrubbing brushes and other rough materials.
No. These and other volatile liquids should not be used for cleaning.
Avoid touching the aluminium fins with bare hands because they can cause injury.
For supported models, it can be washed once every 6 months.
Replacement is recommended once every 3 years for the supported filter type.
Vacuum the dust and, when heavily dirty, soak it in water or lukewarm water for about 10–15 minutes. Dry it in the shade.
No. Do not wring the filter. Shake off the remaining water and let it dry in the shade.
It may reduce deodorizing and air-cleaning performance, reduce heating or cooling performance, and cause odour.
No. Cleaning and replacement intervals can vary by filter type and AC model. For example, the standard air filter is recommended for cleaning every 2 weeks, while certain titanium apatite filters have longer cleaning and replacement intervals.
AC Maintenance Guide
Clean the air filter once every 2 weeks.
Remove the filter, then vacuum the dust or wash it with water.
Use a neutral detergent diluted with lukewarm water, then dry the filter in the shade.
For supported models, clean it once every 6 months.
Replacement is recommended once every 3 years for the supported filter type.
Yes. Dirty filters can reduce cooling and heating performance and may cause odour.
Yes. A dirty air-purifying filter may reduce its ability to clean and deodorize the air.
Yes. Stop the AC and turn off the circuit breaker before cleaning.
Do not use water hotter than 40°C.
No. Avoid scrubbing brushes and other rough materials.
No. These and other volatile liquids should not be used.
No. Avoid touching the aluminium fins with bare hands because they can cause injury.
Wipe it with a soft cloth, using water when needed.
Wipe them with a soft cloth.
Run the unit in FAN mode for several hours, then turn off the breaker, clean the filters and remove the remote batteries.
Yes. Periodic specialist maintenance is recommended because the inside of the AC can become dirty over time and affect performance.
Poor performance, dirty filters, odour or drainage issues can be signs that cleaning or maintenance is needed.
Check that the unit is not damaged or corroded and that nothing is blocking the air inlet or outlet.
Yes. During COOL or DRY operation, the drain should flow smoothly. If there is no drain water and the indoor unit is leaking, the unit should be checked.
Yes. Drain blockage or poor drainage can cause dripping from the indoor unit.
Stop using it and arrange for service, especially if the fault continues or the unit shows abnormal operation.
Daikin AC Energy-Saving Features
Clean the air filter once every 2 weeks.
Vacuum the dust or wash the filter with water. If it is very dirty, use diluted neutral detergent and lukewarm water.
Let the filter dry in the shade before putting it back.
A dirty filter can reduce cooling and heating performance and may cause odour.
For supported models, clean it once every 6 months.
Replacement is recommended once every 3 years for the supported filter type.
Stop the AC and turn off the circuit breaker before cleaning.
No. Do not use water hotter than 40°C.
No. Avoid scrubbing brushes, polishing compounds, thinner, benzine and other volatile liquids.
Wipe it with a soft cloth.
Use a soft cloth to wipe them clean.
Check for corrosion, damage, blocked air inlets or blocked air outlets.
Yes. During COOL or DRY operation, water should drain smoothly. Poor drainage can lead to indoor water leakage.
Yes. Blocked indoor or outdoor air inlets and outlets can reduce performance and cause problems.
Yes. Leaves and debris should not be allowed to build up around the outdoor unit.
Yes. Periodic specialist maintenance is recommended because dirt can build up inside the AC over time and affect performance.
A fixed interval is not specified. Periodic specialist maintenance is recommended based on the condition and use of the AC.
Run the fan for several hours, then switch off the breaker, clean the filters and remove the remote batteries.
Yes. Check that the outdoor unit base and fittings are not damaged or corroded.
Yes. Dirt, blocked airflow and poor drainage can affect AC performance and may lead to problems such as poor cooling or water leakage.
No. Do not dismantle, modify or repair the AC yourself. Faulty work can cause electric shock, fire or water leakage.
Arrange professional service when the AC has poor performance, drainage problems, unusual operation or a fault that continues after basic cleaning and checks.
Daikin AC Timer Guide
The timer can automatically turn the AC on or off at a set time, such as at night or in the morning.
ON Timer starts the AC automatically at the selected time.
OFF Timer stops the AC automatically at the selected time.
Check the clock, press ON Timer, select the time, and confirm the setting.
Check the clock, press OFF Timer, select the time, and confirm the setting.
Yes. The ON and OFF Timer time can be increased or decreased in 10-minute steps.
Yes. You can combine both timers to schedule when the AC should stop and start.
Press the ON Timer button again to cancel the setting.
Press the OFF Timer button again to cancel the setting.
Yes. The internal clock must show the correct time for the ON, OFF and Weekly Timer to work correctly.
Check the AC clock. The timer may also need to be set again after a power failure, breaker shutdown or remote battery replacement.
ON/OFF Timer settings are kept in memory, but the memory is cleared when the remote-control batteries are replaced.
Yes, on supported models. You can schedule different ON and OFF times for different days of the week.
Up to 4 settings per day, with up to 28 settings per week.
You can set the day, ON/OFF time and temperature for ON Timer operation.
Yes. A complete day's reservation can be copied to another day of the week.
They cannot operate at the same time. ON/OFF Timer takes priority when it is set while Weekly Timer is active.
The internal clock can become inaccurate, so the clock should be reset.
Yes. Individual reservations, a day's reservations, or all reservations can be deleted.
Yes. In supported models, Night Set mode adjusts the temperature slightly after the OFF Timer is set to help prevent excessive cooling or heating during sleep.
The actual operating time can vary by up to approximately 10 minutes from the time entered.
When the timer is active, the present time is not displayed on the remote-control screen.
No. Set the correct day and time on the remote before setting the Weekly Timer.
For supported models, the Weekly Timer temperature can be set from 10°C to 32°C, with operating limits applying in COOL, AUTO and HEAT modes.
Yes. OFF-only schedules can be used to automatically turn the AC off at selected times.
Daikin AC Safety Tips
No. Do not dismantle, modify or repair the AC yourself. Incorrect work can cause water leakage, electric shock or fire.
Turn off the power and contact a qualified service professional. Do not continue using the AC.
Do not wash the AC with excessive water. This can cause electric shock or other damage.
No. Always keep your hands dry when operating the AC or remote control.
No. Water can enter the unit and cause electrical insulation problems or electric shock.
No. Use only the refrigerant specified for the unit. Using another refrigerant can cause damage or injury.
Stop using the AC and contact a qualified service professional. Keep the leaked refrigerant away from open flames and heat sources.
No. Keep flammable sprays and similar items away from the air outlet because they can create a fire risk.
Keep flammable items such as spray cans at least 1 metre away from the air outlet.
No. Blocked airflow can reduce performance and may cause operating problems.
Avoid touching them with bare hands because the fins can cause injury.
Yes. Stop the AC and turn off the circuit breaker before cleaning.
No. Stop the unit and switch off the power before cleaning.
No. Use a stable stand and avoid unsafe positions while carrying out maintenance.
No. This can cause injury, damage or the unit to fall.
Yes. Do not allow leaves or debris to collect around the outdoor unit.
Yes. Make sure the drain hose allows smooth drainage to help prevent water leakage and damage.
Yes. The unit should use the specified power supply and a suitable earth connection.
Yes. The safety guidance recommends an earth leakage breaker where required to reduce electric shock risk.
No. Keep flammable materials away from the AC, especially near the air outlet.
No. Stop the unit and seek professional assistance when the AC shows a serious fault or abnormal operation.
Children should be supervised and should not play with the AC or remote control.
No. The installation area should be suitable for the unit, with enough space for airflow, proper drainage and acceptable operating noise.
Yes. Obstructions near the outdoor air outlet can reduce performance and increase operating noise.
No. AC relocation should be handled by qualified personnel because it requires specialised knowledge and skills.
Daikin AC Installation Guidelines
No. AC installation should be done by qualified personnel. Incorrect installation can cause water leakage, electric shock or fire.
Choose a solid location that can support the unit and does not increase noise or vibration.
Place it where the support is strong, airflow is clear, and outdoor air or operating noise will not disturb nearby people.
No. Obstructions near the outdoor air outlet can reduce performance and increase operating noise.
Yes. Water from the outdoor unit should drain to a place with good drainage.
The drain hose should be arranged so water can flow smoothly. Poor drainage can cause water to wet the building or furniture.
Yes. Keep the air outlet clear and do not allow leaves or other debris to build up around the unit.
Keep the indoor unit at least 1 metre away from a TV or radio to reduce possible picture or sound interference.
Yes. The AC should use a separate power circuit dedicated to the air conditioner.
No. Use only the specified power supply for the unit. Using the wrong power supply can cause overheating, fire or other problems.
Yes, an earth leakage breaker is specified for electrical safety, with requirements depending on the installation conditions.
Yes. The unit must be properly earthed. Do not connect the earth to a utility pipe, lightning conductor or telephone earth wire.
Extra care is needed in places with oil, steam, soot, salty air, sulfide gas or conditions that can block the outdoor unit.
Such locations require consultation before installation because salty environments can affect the AC.
These locations should be discussed with the dealer or qualified installation professional before installation.
Yes. Choose a location where outdoor unit noise and warm air will not disturb neighbours.
It is better to keep the area around the indoor unit clear because objects can affect performance, product quality and service life.
Avoid placing objects close to it and keep leaves and debris away from the unit.
Use only the refrigerant specified on the outdoor unit. The covered R32 models specify R32 refrigerant.
Yes. If refrigerant leaks, keep it away from flames such as gas burners, heaters and cooking appliances, and contact a qualified professional.
No. Improper installation or repair can cause water leakage, electric shock or fire.
Yes, but relocation needs specialised knowledge and skills. A qualified professional should handle it.
No. The location should support the unit properly, provide clear airflow, allow good drainage and avoid excessive noise or vibration.
Yes. The installation location should be strong enough to carry the unit without increasing vibration or operating noise.
Avoid flammable materials and sprays near the air outlet. Flammable spray cans should be kept at least 1 metre away from the outlet.
Yes. The room should have proper ventilation when equipment such as a burner is used together with the AC.
Check support strength, airflow, drainage, noise, nearby objects, electrical supply and the surrounding environment.
Daikin Air-Purifying Filters
It is a filter designed to help clean room air and reduce unwanted odors.
It is an air-purifying filter used in supported Daikin AC models to help clean the air and reduce odors.
It helps remove odors and clean the room air.
Yes. A dirty filter may not clean the air or remove odors properly.
Yes. A dirty filter can result in poor cooling or heating.
Yes. Dirty filters may cause odor.
Vacuum the dust. If it is very dirty, soak it in lukewarm water or water for about 10 to 15 minutes.
Shake off the remaining water and let the filter dry in the shade.
No. Do not wring the filter to remove water.
It can be renewed by washing it with water once every 6 months.
Replacement is recommended once every 3 years.
Vacuum the dust. For heavy dirt, soak it in lukewarm water or water for about 10 to 15 minutes, then dry it in the shade.
It is fitted at the back of the air filter on supported models.
Yes. The Titanium Apatite air-purifying filter can be removed and replaced with a new filter when required.
Dispose of the old filter as non-flammable waste.
A replacement filter can be ordered from the dealer where the AC was purchased.
No. The air-purifying filter is included on supported models, so the filter type can vary by model.
It is an air-cleaning function that works with the Titanium Apatite Photocatalytic Air-Purifying Filter and streamer discharge.
It helps reduce bad odors and viruses while cleaning the room air.
Yes. When airflow becomes weak, the streamer may stop temporarily to reduce a small amount of ozone smell from the air outlet.
No. A small ozone smell can be related to streamer operation when airflow becomes weak.
Yes. The normal air filter should also be cleaned regularly, with cleaning recommended every 2 weeks.
Do not use water hotter than 40°C for cleaning.
No. Avoid benzine, gasoline, thinner, polishing compounds and rough brushes.
Yes. Stop the AC and turn off the circuit breaker before cleaning.
No. Avoid touching the aluminium fins with bare hands.
Daikin AC Noise
Yes. Some operating sounds are normal and do not indicate a problem.
It can be caused by refrigerant flowing inside the AC or water being pumped out during cooling or dry operation.
This can happen when the refrigerant flow inside the AC changes.
The sound can occur when the AC slightly expands or contracts because of temperature changes.
A whistling sound can occur when refrigerant flows during defrosting.
Clicking can be caused by refrigerant control valves or electrical parts operating.
It can happen when the exhaust fan runs while the room doors are closed. Opening a window or turning off the exhaust fan can help.
The outdoor unit may be removing frost during defrosting. The HEAT operation should restart after the frost is removed.
The outdoor unit produces operating noise as part of normal operation. Its location should be selected to reduce noise and vibration.
Yes. A weak or unsuitable installation location can increase operating noise and vibration.
Yes. Obstructions near the outdoor air outlet can increase operating noise.
Check that there are no obstructions near the outdoor air outlet. If abnormal noise continues, contact a qualified service professional.
Use the Outdoor Unit Quiet function when available. It lowers outdoor unit noise by changing the outdoor fan speed and frequency.
No. It lowers the outdoor unit noise level; it does not mean the unit becomes silent.
Yes. It is designed to reduce outdoor unit noise when noise needs to be considered for the neighbourhood.
Yes. On supported multi-system models, Night Quiet mode reduces outdoor unit operating noise at night.
Yes. Night Quiet mode can slightly reduce cooling efficiency.
The indoor unit gives a beep when it receives a remote control signal. Different operations can have different beep sounds.
A long beep can indicate that an operation has been stopped.
In a multi-system, refrigerant can still flow through the unit when other connected indoor units are operating.
Yes. Some sounds can occur during idle periods, such as clicking from refrigerant control valves or electrical parts.
No. Several sounds, including water-flowing, blowing, ticking, whistling and clicking sounds, are described as normal operating sounds.
The installation location should be strong enough to avoid increasing operating noise and vibration.
Yes. Keep the outdoor air outlet free from obstructions to help avoid increased noise and poor performance.
Daikin AC Refrigerant/R32
The covered models use R32 refrigerant.
No. Use only the refrigerant specified on the outdoor unit, such as R32 for the covered models.
The refrigerant is described as safe and normally does not leak.
Yes. Poor cooling or no cool or warm air can be a sign of refrigerant leakage.
Stop using the AC and contact a qualified service professional.
No. Do not use it until a qualified professional confirms that the leak has been repaired.
A refrigerant leak must not come into contact with flames from gas heaters, kerosene heaters, gas ranges or other burners.
Yes. Contact between leaked refrigerant and a naked flame, heater or cooker can produce harmful gas.
No. Installation, repair and refrigerant work should be handled by qualified personnel.
No. Refrigerant-related repair work should be handled by qualified service personnel.
Refrigerant leakage can be one possible cause, so qualified service assistance may be needed.
Yes. Only use the refrigerant specified on the outdoor unit.
Yes. The specified refrigerant must be used when installing, moving or repairing the AC.
Yes. Using a different refrigerant can cause trouble, damage the unit or cause personal injury.
Improper installation can cause water leakage, electric shock or fire, so installation should be done by qualified personnel.
Yes, the covered R32 split-series models are filled with R32.
The instructions caution that refrigerants may not have an odor, so smell should not be relied on to detect a leak.
Stop using the AC and arrange qualified service assistance. Refrigerant leakage may be a possible cause.
Under certain conditions, condensation on refrigerant pipes can contribute to dripping.
No. The refrigerant normally does not leak.
Yes. Keep leaked refrigerant away from naked flames, gas heaters, kerosene heaters and gas ranges.
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