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Three recognizable problems Daikin mini-split owners may encounter are weak cooling or heating, unexpected stops or flashing error indicators, and water leaking from the indoor unit. Daikin lists these symptoms in its troubleshooting guidance, but does not establish that they are the most frequent problems or rank them by prevalence. Start with the safe checks below; for model-specific instructions, use the manual for your exact unit.
The air conditioner does not cool or heat the room well
Before arranging service, check the controls and airflow. A remote set to the wrong operating mode or temperature can make the system seem ineffective. Daikin also recommends cleaning the air filters as directed in the correct owner’s manual and making sure objects are not blocking the indoor or outdoor unit’s air inlets and outlets. See Daikin’s troubleshooting guidance.
- Confirm the selected mode and set temperature on the remote.
- Inspect and clean the filters using the procedure for your model; do not assume every unit’s filter is removed or cleaned the same way.
- Clear obstructions from the indoor and outdoor air inlets and outlets.
If performance remains poor after those checks, contact the installer or Daikin. Weak heating or cooling alone does not establish that the system needs refrigerant; refrigerant diagnosis and handling belong with qualified service personnel.
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For an unexpected stop accompanied by a flashing operation lamp, Daikin recommends checking whether the air filter is dirty and whether an inlet or outlet is obstructed. Clean the filter according to the model’s manual and clear any blockage. If the symptom continues, contact the place of purchase, installer, or a Daikin representative.
#1 Best Overall
- Replacement part number：4007597
- Compatible Model: Fit For Daikin Models CTKS20KVMA, CTXS07LVJU, CTXS07WVJU9, CTXS20KVMA, FTKM09NV2S, FTKM12NV2S, FTKM15NV2S, FTKM20PVMA, FTKM25NVM, FTKM25PVMA, FTKM35NVM, FTKM35PVMA, FTKM42NVM, FTKM46PVMA FTKS09HV2S, FTKS09JV2S, FTKS12HV2S, FTKS12JV2S, FTKS20KVLT FTKS20KVMA, FTKS20LVMA, FTKS22MVLT
- High quality materials: The use of high quality synthetic fibers to provide efficient filtration and long-lasting performance to ensure that excellent filtration performance can be maintained over a long period of time
- Function: Solve the problem of filter blockage, effectively capture dust, improve indoor air quality
- Reusable: Support cleaning and reuse, reduce replacement frequency, reduce maintenance costs, environmental protection and economy
Record the code before calling
If the unit displays an error code, write down the exact code and provide it along with the indoor- and outdoor-unit model details to the installer. Daikin cautions that explanations can vary by model; its general error-code search is intended for dealers experienced in repair, rather than as a do-it-yourself repair guide. Daikin India, for example, lists U0 as refrigerant shortage in its regional error-code table; that example is not a universal diagnosis for every Daikin system.
Do not open the equipment, attempt electrical diagnosis, or handle refrigerant based on a code found online. Daikin’s model-specific RXYTQ-TYF installation manual warns against resetting a tripped breaker without first checking for insulation problems. Repeated breaker or safety-device activation should be handled by qualified service personnel.
Rank #2
- Package Contents: You will get 2*KAF970A46 Titanium Apatite Photocatalytic Air Purifying Filter, filter dimensions: 10" x 1-5/8". Does not include required mounting frame #1597259
- Suitable for the following models: A5WMY10KR, A5WMY15KR, AT09KV2S, AT13KV2S, AT24KV2S, ATXM20M2V1B, ATXM25M2V1B, ATXM35M2V1B, ATX20GV1B, ATX25GV1B, ATX35GV1B, ATX20JV1B, ATX25JV1B, ATX35JV1B, ATX20J2V1B, ATX25J2V1B, ATX35J2V1B, ATXS20G2V1B, ATXS25G2V1B, ATXS35G2V1B, ATXS42G2V1B, ATXS50G2V1B, ATXS20K2V1B, ATXS25K2V1B, ATXS35K2V1B, ATXS50K2V1B, CTKS20KVMA, CTKS30KVLT, CTKS60JVLT, CTKS50JVLT, CTKS70JVLT. Models not all listed, other models please see the product details page
- Excellent Quality:The KAF970A46 Filter is made of high quality UP Titanium material and are the best alternative to your original filter.It can make your air conditioner run more efficiently,can better filter dust and remove odor
- Easy to install:Replacing is very simple,just remove the old filter from the frame and replace it with a new one,greatly saving you time and money
- Maintenance & Care:The KAF970A46 Filter delivers consistent performance,for the bestresults,wash every three months and replace every 2-3 years
Water leaks from the indoor unit
When water appears at the indoor unit, check whether water is discharging outside through the drain hose. Daikin advises removing obstructions from the hose end. A bend or blockage in the drainage path can stop water from draining properly. If the hose and visible outlet are clear but leakage continues, contact the installer or Daikin rather than disassembling the unit.
A dirty indoor air filter can also contribute to condensate forming and leaking from the air outlet. Follow the exact unit’s manual for filter-cleaning instructions; Daikin’s troubleshooting page covers both filter and drainage checks.
Rank #3
- Perfect Compatibility: Mini split filter fit for Daikin FTKM25NVM FTKM25PVMA FTKM35NVM FTKM35PVMA FTKS09HV2S FTKS09JV2S FTKS12HV2S FTKS12JV2S FTKS20KVMA FTKS25KVMA FTKS35KVMA FTKS35LVMA FTXM25PVMA FTXM35PVMA FTXM25PVMA FTXM35PVMA FTXM22NVLT FTXM28NVLT FTXM36NVLT FTXS09LVJU FTXS12LVJU FTXS09LVJU FTXS20KVMA FTXS25KVMA FTN35KV1A FTYN35KV1A and more multiple mini split models, replace 4007597, each filter measures 12.4 × 11.8 inches, ensuring a precise fit, maintain stable performance
- High-Efficiency Filtration: Mini split filter is made of premium multi-layer filter material, effectively filter dust particles etc, it helps ensuring clean airflow and enjoy fresher indoor conditions
- Enhance Air Conditioner Performance: Regularly replacing your split filter can significantly boost air conditioner efficiency, improving cooling and heating performance, keep your equipment stronger airflow, faster temperature control, and quieter operation
- Durable and Long-lasting: Mini split filter crafted from high-strength, tear-resistant material, offers excellent filtration without easily deforming or breaking, durable with long service life, enjoy lasting reliability and consistent performance
- Easy to Install & Maintain: No tools required, simply open the air conditioner front panel, take off the old filter, and insert the new filter, please turn off the power before replacement for safety,easy maintenance helps keep your air conditioner system running efficiently
Replacing a filter
Daikin lists filters among its parts and consumables, but there is no universal replacement filter established for all Daikin mini-splits. Match any replacement to the exact indoor-unit model and manual, and check local availability through Daikin’s after-sales service information or your local support channel. Daikin North America’s Owner Support Center provides manuals and warranty resources for that region.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When to stop troubleshooting and call for service
- Burning smell or another unusual condition: Stop operation and shut off power. Daikin warns that continued operation can risk equipment damage, electric shock, or fire.
- Repeated breaker or safety-device trips: Do not keep resetting the breaker. Arrange qualified service; Daikin’s error guidance warns that insulation problems should be checked before a reset.
- Persistent water leakage: Stop relying on simple hose checks and contact the installer or Daikin.
- Persistent error indication or poor performance after basic checks: Give the service provider the exact code, if present, and the unit model details.
These cautions are consistent with the service and safety instructions in Daikin’s model-specific installation manual. Instructions and code meanings can differ by model and region, so use the documentation for your equipment.
Quick Recap
Best Value
- Dimensions: 16-1/4" x 14-1/2"
Rank #4
- Package Contents:You will get 4*99A0391 Mini Split Air Purifying Filter,without Frames.You need to use the original frame to install these filters
- Compatibility:Perfectly compatible with Daikin Mini Split Units,fit for the following devices, CTKM50RVM4, CTKM60RVM4, CTKS20KVMA, CTXS07LVJU, CTXS07WVJU9, CTXS20KVMA, DTXF60TVMA, DTXF71TVMA, ETL35TV16X2, FTHF60RVLT, FTHF71RVLT, FTHM50RAVIN, FTHM60RAV1N, FTHM71RAVIN, FTKC15TV2S, FTKC18TV2S, FTKC24TV2S, FTKC28TV2S, FTKC50TAV1N, FTKC50TV1N, FTKC60TAV1N, FTKC60TV1N, FTKC71TAV1N. Not all models are listed, not sure if your air conditioner is compatible, feel free to email us and we will answer your questions
- Excellent quality: Our filters are made of high-quality raw materials and are the best alternative to your original filter, It can make your air conditioner run more efficiently, can better filter dust and remove odor
- Product size:10"x 1-3/4".Please confirm that your filter size matches ours before placing an order
- Easy to install:Replacing is very simple, just remove the old filter from the frame and replace it with a new one,greatly saving you time and money
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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