How many condenses do you have? Is one a multi head? Does the fault occur when all the heads from the multi head are turned on or only when one is turned off? If one is running, does the other heads coil get cold while off? No? Turn the on and the other off If possible send a pic of the piping coming out of the condenser Answer from Nerfixion on reddit.com
Penair
penair.com.au › home › how to reset a daikin air conditioner
Daikin Troubleshooting: Error Codes & Resetting A Daikin
November 10, 2025 - The reset function for a Daikin air conditioner is typically activated through the remote control.
Reddit
reddit.com › r/hvacadvice › uh and a5 error code daikin minisplits
r/hvacadvice on Reddit: UH and A5 error code daikin minisplits
June 24, 2023 -
Bought a new house (~750 sq ft) with daikin minisplits, one downstairs (FTXS18LVJU) and two upstairs (CTXS07LVJU). Was having issues with them randomly shutting off and throwing UH error code and one daikin being 10x colder than others. daikin sent out a contractor (which is bs btw, do they not have dedicated techs that just inspect?) and he said the tubing was wrong and it was a $3000 fix. thought it was fishy, had a 2nd hvac guy come out and he said heat pump (4MXS36RMVJU) had low refrigerant and filled it back up. now all blow fairly cold, but if i turn off one of the daikins, then they still go into error mode UH after ~30 mins. any thoughts?
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How many condenses do you have? Is one a multi head? Does the fault occur when all the heads from the multi head are turned on or only when one is turned off? If one is running, does the other heads coil get cold while off? No? Turn the on and the other off If possible send a pic of the piping coming out of the condenser
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What you have is a Daikin Multiport. The problem is likely that the installing contractor mixed up the wiring from the outdoor to the indoor units. Daikin Multiports come with a fix from the factory for this as it’s a common issue. Turn off all indoor units from the remote controllers or thermostats. Remove cover above where the copper line sets leave the outdoor unit by way of two Phillips head screws. You will see a circuit board to the left with several LED lights (4-5 lights). Turn off power to outdoor unit by way of the breaker or the disconnect. Cycle power back on and wait for 5 minutes. Press and release the SW3 button located on the board to the left being very careful not to touch any of the wiring labeled A, B, C, etc. as these wires will have 208-230V active on them. This has initiated the wrong wiring check. If the check has been initiated you will see a flashing pattern of red lights on the board on the left. The test will then run for 10-20 minutes at which time the outdoor unit will shut off. If there were any inconsistencies in the wrong scheme from the outdoor to any or all of the indoor units, then the outdoor unit will automatically correct the wiring internally through the board logic and no physical change will be needed of the wiring scheme. What is basically happening when the wires from A, B, etc. do not correspond correctly to the Port A, Port B, etc. is that the refrigerant goes to an air handler that the blower is not currently running on or is running on low-low, so that the indoor unit begins to freeze up and an A5 error code is given. As you’ve said, the problem doesn’t happen when all indoor units are running as it doesn’t matter at that point that the refrigerant is going to wrong indoor unit as refrigerant is going to all indoor units and all indoor blowers are running. For years this has been the very first thing I do when I come upon a Daikin multiport as I’ve no idea who has been there before me, or if the installer did it correctly or not. It should be noted also that this change is stored in the PCB on the outdoor unit. So in the future if the outdoor unit circuit board is ever replaced or if the entire outdoor unit replaced, the wrong wiring check will need to be done again or else you’re back in the same boat as before.
Daikin Split-Unit...A5 error message
Having the same issue now unit is only 11 months old. Had people out here twice. Said it looks fine of course works fine when they are here. Was yours fixed? More on reddit.com
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December 19, 2023UH and A5 error code daikin minisplits
How many condenses do you have? Is one a multi head? Does the fault occur when all the heads from the multi head are turned on or only when one is turned off? If one is running, does the other heads coil get cold while off? No? Turn the on and the other off If possible send a pic of the piping coming out of the condenser More on reddit.com
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June 24, 2023Daikin Split gives A5/UH error code when set to cool?
Daikin AC Units split- Errors UH and A5
A5 is a coil over or under temp depending on the mode. UH means another unit on that system has an A5. A C4 is a thermistor failure. You probably had a thermistor failure that reported a bad coil temp, triggering the A5 and UH. It’s a pretty easy replacement. More on reddit.com
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March 19, 2024How do you reset a Daikin fault?
To reset a Daikin fault, you must enter the diagnostic mode using the remote control to retrieve the fault code. Then, use the On/Off button to reset the unit. If the fault persists, professional assistance may be required.
penair.com.au
penair.com.au › home › how to reset a daikin air conditioner
Daikin Troubleshooting: Error Codes & Resetting A Daikin
Where is the reset button on a Daikin?
The reset function for a Daikin air conditioner is typically activated through the remote control. Instead of a separate reset button, the On/Off button acts as the Daikin Air Conditioner reset button.
penair.com.au
penair.com.au › home › how to reset a daikin air conditioner
Daikin Troubleshooting: Error Codes & Resetting A Daikin
Why is my Daikin air conditioner not starting?
If you experience issues like your Daikin AC not turning on, check for any power supply issues first. If the power supply is fine, try resetting the unit using the remote control. Persistent starting issues might indicate a more serious problem needing professional attention.
penair.com.au
penair.com.au › home › how to reset a daikin air conditioner
Daikin Troubleshooting: Error Codes & Resetting A Daikin
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JustAnswer
justanswer.com › hvac › nnj5r-a5-error-code-daikin-ftxs12lvju-haven-t-able-find.html
A5 Error Code Daikin FTXS12LVJU? Expert Troubleshooting Guide
December 14, 2023 - First, check the wiring connections for loose or damaged cables. Inspect the PCB boards for signs of corrosion or burn marks. Reset the system by turning off power for five minutes.
Airchillac
airchillac.com › daikin-ac-error-codes
Daikin AC Error Codes Guide – Fixes, and Troubleshooting Tips | AirChill AC Maintenance and Duct Cleaning
June 5, 2025 - Common Daikin AC error codes, what they mean, and how to fix them easily. Full list of Daikin air conditioner error codes, error reset codes.
Silverback Air-con
silverbackaircon.sg › home › aircon error code › daikin error code › daikin a5 error code and how to fix it
Daikin A5 Error Code and How To Fix It - Silverback Air-con
February 23, 2024 - If you are wondering what the Daikin A5 error code is, a simple search on google will give you an answer. It is stated that the error code means that there is a high pressure control in heating, freeze up control in cooling. The reason why you are in this article is likely to know more about ...
Daikin
daikin.com › products › ac › services › error_codes
Error Codes | After Sales Service | Air Conditioning and Refrigeration | Daikin Global
By checking the error code, you are able to identify the status and the issue of the air conditioner/air conditioning system.
Daikin
daikin.com › - › media › Project › Daikin › daikin_com › products › ac › services › error_codes › pdf › sm-ts3_p7-8_howtocheck-pdf.pdf pdf
UNIT NO. 1 CODE UNIT NO. 1 3. Press MODE selector button. 4. Change the
UNIT NO. 1 · 3. Press MODE · selector button · 4. Change the · upper digit · 1. Press · INSPECTION/TEST · button · 6. Change the
Trane
partshnc.com › blog › how-to-reset-your-daikin-air-conditioner
How to Reset Daikin Air Conditioner: A Comprehensive Guide
March 11, 2024 - To reset a Daikin error code, you can unplug the air conditioner from the power source or use the remote control to reset the AC.
Mytour
mytour.vn › home › travel › decoding daikin's a5 error code: origins and detailed solutions
Daikin A5 Error Code: Causes and Detailed Solutions | Mytour.vn
November 6, 2024 - + Step 2: Press and hold the CANCEL button for 5-7 seconds until the remote control's screen displays error code 00. + Step 3: Press and release the CANCEL button in intervals. When you hear a beep from the indoor unit, it indicates the Daikin ...
U Sin Aircon
usinaircon.com.sg › daikin-error-code-a5-troubleshooting
Fix Daikin Error Code A5: Simple Solutions & Prevention Tips
October 22, 2024 - Fix Daikin Error Code A5 with simple steps. Learn the causes and prevention tips to keep your aircon running efficiently and your home comfortable.
Call +6590615191
Address 31, Woodlands Close #05-09,, 737855, Woodlands Horizon
Reddit
reddit.com › r/hvacadvice › daikin split-unit...a5 error message
r/hvacadvice on Reddit: Daikin Split-Unit...A5 error message
December 19, 2023 -
One of my Daikin Mini-Split units is occasionally giving an A5 error while in A/C mode. We received the error code after the unit not coming on when turned on via the remote. The temp is set to 75F degrees. We had our A/C guy come out a couple of weeks ago to check it. The filters are clean and clear (inside/outside) etc. A/C guy said all looked good. We also checked the breaker and all is good there. When we get the error message, flipping the breaker resets the unit and then it will turned on.
Has anyone else had this issue with their Daikin Mini-Split? If yes, can you share your experience and the resolution please? Thank you.
Daikinairconditionerservice
daikinairconditionerservice.com.au › home › daikin air conditioner error codes
Daikin AC Error Codes: Full List, Meanings & Fixes 2026
1 week ago - If the code is A5 and the filter is visibly dirty, clean the filter before resetting. If the code is A3 and the drain pan is overflowing, empty it and attempt to clear the drain before resetting. If the code is E3 and the outdoor unit is surrounded by debris, clear the obstruction before resetting.
Daikin
my.daikin.eu › content › dam › DASW › supportavdelningen › Felkoder_SM-TS3errorcode_chart.pdf pdf
Simple Self-Diagnosis by Malfunction Code After Sales Service Division (SM-TS3)
Simple Self-Diagnosis by Malfunction Code · After Sales Service Division
Airway Group
airway-group.co.uk › home › help & advice › daikin air conditioning fault codes explained [infographic]
Daikin Air Conditioning Fault Codes Explained [Infographic] | Airway
April 2, 2026 - U5 – Communication error between indoor unit and remote controller – A possible mistake with the interconnection wires, or a PCB fault with the indoor/outdoor remote controller. UA – Combination error of indoor/BS/outdoor unit, setting error of PCB at site – There is an incorrect combination of indoor, BS or outdoor units (the wrong quantity or models, for example). If you’re in the Cambridge area, our locally based air-conditioning engineers can fix the issue the same day. Further afield? Book a Daikin repair service or just contact us.
JustAnswer
justanswer.com › hvac › mpcbg-installed-zone-daikin-mini-split-system-month.html
Daikin Mini Split A5 & UH Error Fix: Expert Q&A Guide
August 9, 2023 - For A5 errors, inspect indoor unit wiring connections and ensure the PCB is secure; clean or replace the indoor fan motor if noisy. UH errors indicate outdoor unit overheating—check for blocked condenser coils, dirty filters, or low refrigerant ...
RemoveandReplace.com
removeandreplace.com › home › home air conditioning › daikin air conditioner ac error codes
DAIKIN Air Conditioner AC Error Codes
December 22, 2022 - See below for ALL DAIKIN AC Error or Fault Codes. ... NOTE: This is a general “quick reference” fault code list, see further below the list for more detailed error codes, the definition of the code, and how to fix the issue. AO Indoor Error of external protection device A1 Indoor PCB defect A3 Indoor Malfunction of drain Level control system A5 Indoor Freeze-up prevention A6 Indoor Fan motor lock – overload A7 Indoor Malfunction of swing motor flap A9 Indoor Malfunction of EEV AF Indoor Drain level above limit – clogged AJ Indoor Malfunction of capacity set device
Airconditioningmackay
airconditioningmackay.com.au › home › daikin air conditioner error codes
Daikin Air Conditioner Error Codes and Troubleshooting Faults
January 22, 2026 - The list below features all the malfunction error codes for Daikin air conditioners and their potential causes. You may determine the state and problem of the air conditioner or air conditioning system by looking up the error code. ... The light is off on my air conditioner. ... The air conditioner is not heating or cooling the room properly. Have you set the temperature and operating mode correctly on the remote controller?
CoolAutomation
coolautomation.com › blog › daikin error codes: comprehensive breakdown
Daikin Error Codes (Malfunction Self-Diagnosis)
July 20, 2025 - Other centralized control power disconnection Centralized control reset switch ON Defect of transmission wiring Central remote controller address change
JustAnswer
justanswer.com › hvac › 5a4px-daikin-split-type-air-conditioner.html
Daikin Split System Troubleshooting & FAQs | Expert Answers
Inspect the indoor fan for proper operation. If the problem persists, refrigerant levels may be low, requiring a certified technician. To reset, power off the unit for 5 minutes, then restart.
HVAC In Expert
hvacinexpert.com › home › daikin ac error codes list
Daikin AC Error Codes List
April 14, 2026 - Daikin AC error codes list with complete fault meanings, causes, and troubleshooting steps for inverter and split AC models.