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.
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 - The Daikin A5 error code typically signals that the air going inside the air conditioner is way colder than the regulated temperature. It can be caused by an aircon valve problem, which is very expensive to fix, a faulty indoor thermistor, evaporator coil, or compressor.
A5 error code. Daikin ftxs12lvju. Haven't been able to find
A5 error code. Daikin ftxs12lvju. Haven't been able to find info on what to do with A5 error code More on justanswer.com
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December 14, 2023Daikin mini split
https://youtu.be/T3CdCr0QD1w Pull any error codes using the remote. You can Google the codes or look them up in the manual if you have it. When you call for service give them the codes it will give them a clue what to expect. More on reddit.com
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September 1, 2019Daikin Mini split- error code U4
There’s a specific process to it. Need a Daikin d checker tool to really further diagnose More on reddit.com
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November 25, 2023[deleted by user]
That looks to be the install test mode. Usually initiated by setting the delay to 17hr then pressing and holding start then A5 would show up and you would press it again and it would just run through a quick test of the various components and finish with a Ot. More on reddit.com
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Daikin India
daikinindia.com › product-services › product-services › error-codes
Error Codes | Daikin
The remote controller can receive relevant error codes from the indoor unit. The code indication changes as shown below, and notifies with a long beep. ... Customer Support Information: WhatsApp us your query @ 9871409300. Call Our Customer Contact Centre: 011-40319300 / 1860 180 3900 or Write To Us at customerservice@daikinindia.com X
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.
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 ...
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Any advice on fixing the A5 code error?
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HVAC-Talk
hvac-talk.com › home › forums › ask our pros-owner assistance - no diy advice › aop residential hvac/refrigeration(beenthere zone)
Daikin A5 and UH errors - wiring issue? | HVAC-Talk: Heating, Air & Refrigeration Discussion
July 9, 2024 - Just ran a test 08:10 Lower ground ... ground floor, A5 error on lower ground ... I notice in the Daikin app that it says "Operation conflict"....
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 - 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.
U Sin Aircon
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2024 Daikin Aircon Error Codes: DIY Tweaks for Singaporean
August 25, 2025 - Daikin aircon error codes signal specific issues, ranging from minor maintenance to potential major repairs. Recognizing these codes helps you quickly identify and address problems.
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JustAnswer
justanswer.com › hvac › 5a4px-daikin-split-type-air-conditioner.html
Daikin Split System Troubleshooting & FAQs | Expert Answers
Split AC systems often face indoor coil freeze-up and sensor malfunctions causing error codes. Error A5 indicates indoor coil freeze-up, triggered by low airflow or refrigerant issues. First, turn off the unit and let the ice thaw completely.
Parts Town
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Daikin Air Conditioner Fault Codes | Parts Town
Outdoor units have fault codes that either start with the letter E, F, H, J, L, M or P. For more guides on HVAC equipment, check out our full collection of Daikin manuals for assistance.
Valley Air Conditioning
valleyairconditioning.com.au › home › daikin air conditioner error codes
Daikin Air Conditioner Error Codes and Troubleshooting
January 22, 2026 - The list below features all the malfunction error codes for Daikin air conditioners and their potential causes.
GetQuickAir
getquickair.com.au › brands › daikin › common-ac-error-codes
Common Error Code on Daikin Air Conditioning Unit | QuickAir
January 2, 2025 - The A5 error code on a Daikin air conditioning unit indicates an issue with high-pressure control in heating mode or freeze-up protection control in cooling mode.
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.
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Have a 10yr old Altherma AHP, now running with fault code ...
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Daikincomfort
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Service Manual 2MXS-N, 3/4MXS-R Series SiUS121736EA [Applied Models]
Signal Transmission Error (Between Indoor Unit and Outdoor Unit)........
Total Air
airconditioningperth.com.au › home › daikin air conditioning perth › daikin error codes
Daikin Error Codes - Repair your Daikin Air Conditioner
December 5, 2024 - If your Daikin air conditioning system is showing an error code then air conditioning Perth can assist.
338 Aircon Singapore
338aircon.sg › post › daikin-aircon-error-code
Daikin Aircon Error Code: How to Check and Fix it? A Simple Guide for Homeowners
January 5, 2025 - ... A1: Indicates a problem with the indoor unit’s circuit board, including the inverter PCB. A5: indicates high pressure control in heating; freeze-up protection control in cooling.
Lioncityaircon
lioncityaircon.sg › home › home improvement › daikin aircon error codes explained (full list + fix guide 2026)
Daikin Aircon Error Codes Explained
August 23, 2024 - If A5 persists after a clean filter, the thermistor or coil needs attention. The indoor fan motor isn’t responding correctly. Causes include broken wires in the motor harness, a defective fan motor, or a faulty indoor PCB. Fan motor replacement on a Daikin typically runs $200 to $350 in Singapore.
LinkedIn
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Field Paper North American Cooling Season Alert: Daikin ...
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