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
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.
MachineLounge
machinelounge.com › home › daikin air conditioner fault codes, meaning, and fixes
Daikin air conditioner fault codes, meaning, and fixes - MachineLounge
May 2, 2023 - In addition, check the filters. To reset, turn off power to the AC system for approx.. 5 minutes then retry. Probable causes: Broken wiring in or short circuit of or the disconnection of connector(s) from fan motor harness ·
A5 error code. Daikin ftxs12lvju. Haven't been able to find
The A5 error on Daikin FTXS12LVJU indicates a communication failure between the indoor and outdoor units. 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. More on justanswer.com
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December 14, 2023Daikin 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, 2023Daikin 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, 2024UH 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, 2023How 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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Penair
penair.com.au › home › how to reset a daikin air conditioner
Daikin Troubleshooting: Error Codes & Resetting A Daikin
November 10, 2025 - Note this code and reset your system by switching off the mains power and leaving it for 20 – 30 minutes. This reset may be all you need to fix the issue; however, if the system malfunctions again or doesn’t work after the reset, contact ...
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 - So, what causes Daikin A5 error code? If you pay attention to the previous paragraph. You will need to check on other fan coil units to see if there are other error codes that occur beside A5. If there is a UH error code appearing on another fan coil. It could be that the ev coil in the condenser unit has broken down.
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
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 ...
Daikin
daikin.com › products › ac › services › error_codes
Error Codes | After Sales Service | Air Conditioning and Refrigeration | Daikin Global
Error Code Search offers information on the cause of the malfunction and the status of your air conditioner by entering the error code. Error Code Search List of Error Codes(0.1MB) Please refer to "How to Check Error Codes" for step-by-step instruction to check the error codes.
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.
RemoveandReplace.com
removeandreplace.com › home › home air conditioning › daikin air conditioner ac error codes
DAIKIN Air Conditioner AC Error Codes
December 22, 2022 - Daikin AC Error Code = M8 Error Code Definition = Malfunction of transmission between optional controllers for centralized control – Centralized control power disconnection What To Fix/Check/Replace = Centralized control reset switch ON – Defective transmission wiring – Central remote controller change
Fixurge LLC
fixurge.com › home › daikin › daikin a5 error code: causes, fixes, and how to solve it
Daikin A5 Error Code: Causes, Fixes & Frozen Coil Solution
April 20, 2026 - Daikin A5 error means coil temperature issue. Learn how to fix airflow problems, frozen coils, and restore your AC quickly.
Address 1055 Wilshire Blvd. Suite 900-B, 90017, Los Angeles
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
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 - Sometimes the error will stay even after the issue is fixed. In that case, you can try to reset the AC. Turn off your Daikin AC. Press and hold the “Cancel” button on the remote. Error codes will flash on the screen.
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
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.
Star-supply
star-supply.com › content › Daikin-Troubleshooting Codes.pdf pdf
Trouble Shooting www.climatecenter.co.uk Daikin Trouble Shooting Guide
Daikin Fault Codes · Indoor Fault Codes · Fault Code · Definition · Supposed Causes · Split · Skyair · VRV · Package · A0 · External protection active · External protection wired to T1-T2 active · • · • · • · A1 · Failure of indoor PCB · Defect of PCB or noise · • · • · • · • · A3 · High water level · Float switch open circuit · • · • · • · A5 ...
Silverback Air-con
silverbackaircon.sg › home › aircon error code › daikin error code › ultimate guide to daikin e5 error code: how to solve it
Ultimate Guide to Daikin E5 Error Code: How to Solve it - Silverback Air-con
October 28, 2025 - An overloaded compressor can either be from lack of maintenance or there’s an issue with the sensor (or the wiring) that reads the overload. To fix an E5 error, performing a compressor chemical wash (for an initial price of $80) might do it.
Lioncityaircon
lioncityaircon.sg › home › home improvement › daikin aircon error codes explained (full list + fix guide 2026)
Daikin Aircon Error Codes: Full List + What to Do (2026)
August 23, 2024 - If you’re using a typical Daikin in an HDB flat or condo, this is probably your remote. ... Hold the Timer Cancel button for 5 seconds. A “00” indication will flash on the temperature display.
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 - After prolonged use, your Daikin air conditioner may indicate the A5 error code and cease operation, leaving you worried about which component is malfunctioning. Wondering what causes the Daikin A5 error code and how to fix it? Let's find out together!
Fixurge LLC
fixurge.com › home › daikin › daikin error codes: full list and how to fix them
Daikin Error Codes Guide: Full List + Troubleshooting (2026)
April 22, 2026 - Complete Daikin error code list with clear meanings, causes, and fixes. Diagnose your AC step by step and know when to call HVAC repair.
Address 1055 Wilshire Blvd. Suite 900-B, 90017, Los Angeles
Skycon Air Pty Ltd
skyconair.com.au › home › error codes › daikin error codes › a5
Daikin A5 Error Code
May 8, 2025 - The A5 error code is related to high pressure control in heating or freeze-up protection in cooling.