How to fault find a Daikin air conditioner, troubleshoot split system ductless, green light flashing

[@infoscm4610]

Absolutely spot-on advice! We suffered a power failure and brown out that damaged a lot of equipment. When our Daikin aircon system wouldn't power up we feared the worst for that too. A sincere thankyou!

[@FullyAirconditioned]

Glad to help mate 👍🏻

[@thekeytoall]

😅😅😅😅😅0.54 😅😅😅😅😅😅😊😅😅😅😊😊😊😊😮😊​@@FullyAirconditioned

[@gordonmcrae1959]

Thank you, just followed your instructions, U4 , on 2 x ac, 1 I hadn’t used for 2 years, the other 6mth, now both working. 👍

[@FullyAirconditioned]

u4 is most probably caused from a power problem, under voltage or over voltage

[@Giorgos-k1e]

​@@FullyAirconditioned brother can you please explain me the P8 error code please 😢😢😢😢😢

[@FullyAirconditioned]

@ Insufficient refrigerant during test operation. Need to connect refrigerant tank to charging port for auto charging [VRVIIIQ / VeUp Q only] With the VRV it has an automatic addition charge function, you can measure the pipe size lengths and calculate the additional charge or you can put it into auto charge. I believe the p8 fault come up when the refrigerant cylinder doesn’t have enough hose or runs out, possibly low pressure as well.

[@gillnewcombe2014]

Thank you so much for sharing your time and knowledge. Followed your very clear instructions and solved a U2 issue at a time when I really need my air-con 🙏

[@fryan4159]

This pensioner here could not follow your instructions so turned off power supply as per your suggestion for 20 seconds >>> green light is solid and air conditioner now working... Thank you... EDIT: Start of a long 3 day weekend {Public holiday} with each day expected over 35 degree plus hot week following... Cannot imagine how long the waiting time for an appointment with a service guy to be available, so am extremely happy 😊

[@FullyAirconditioned]

End result = unit working No problems 👍🏻

[@DonnaSacknoff-tk4vx]

This was very helpful. Thank you! Helped me find error code J3. Now to figure out how to fix that!! 😊

[@FullyAirconditioned]

Hi Donna, J3 is a faulty discharge pipe thermistor, its reading outside its range, either open circuit or closed circuit, in the rare case its a faulty pc board (99% of the time it's a thermistor). The thermistor will need replacing, depending on the model it could be a single thermistor that plugs into the pc board or it could be a thermistor harness which will include 5 or 6 thermistors on the one plug. Best to get your local authorised Daikin dealer out to repair it.

[@DonnaSacknoff-tk4vx]

@ Thank you. I changed batteries on all remotes, turned all the mini splits off over night (there are four) then shut the circuit breaker /power off for about 45 seconds this morning, and everything seems to be working fine now! The code was cleared. Will keep an eye out for a fault /J3 code again but for now I’m warm with fingers crossed. Thank you for your help and great information!

[@aus_aircon_ref_mech6671]

Great video. I didn’t know about the double beep!

[@Guovssohas]

I have a very new Daikin heatpump, maybe a little over a month old now and it seems to be going into defrost mode way too often, like every 17 to 20minutes and it takes 15minutes to defrost. So almost half the time goes to defrosting the thing. And when it starts defrosting, there's no ice buildup on the outside unit, i've checked. That can't be right is it? Why does it defrost when there's no ice?

[@FullyAirconditioned]

Doesn’t sound right, have you watched my defrost video, this explains how, why and when your Daikin’s units gos into defrost. I would be getting the people who installed it sounds like there is a problem.

[@Guovssohas]

@@FullyAirconditioned I watched many vids about these things. Some of them talked about timers that each manufacturer put on the board, commonly 30-60 or 90mins, meaning minimum runtime until next defrost cycle. What timings does Daikin have on these things? Is one of them about 17 to 20 minutes like mine does? Anyway on mine something clearly triggers the defrost cycle even when not needed.

[@FullyAirconditioned]

kzbin.info/www/bejne/d2e0hnmqo7Gob8Usi=mJE-CzTg5OSRcdwE There many reasons and ways systems chose to go into defrost and it depends on the brand and where it’s made. The most simple and basic is the defrost time you described, after a set amount of time if the coil temp is below the pre set temperature the system will go through a defrost. The daikin’s units like in my video (link above) doesn’t have a defrost time as such, it has a defrost function that is triggered by a number of different scenarios. The daikin units like in my video, have multiple sensors, on the coil, outside temp, suction temp liquid line temp, suction pressure sensor, and an on board Computer deciding when to go into defrost. It looks at temperature, gas pressure, temp outside, coil temperature and a number of other input, not just time and coil temperature. But depending on where the unit is made, if it is an American style outdoor unit, the standard looking barrel type system, that one is made in the US and it has basic defrost timer.

[@Guovssohas]

@@FullyAirconditioned Ok. I live in Norway, northern europe. The ones we have here are made for nordic conditions, pretty cold environments. I'm pretty sure they have that combination of sensors you described and one of them is probably having a problem in my case.

[@michaelosucha5747]

Thanks so much, I just installed a Daikin ftxng18axvju invertor and a rxng18axvju outdoor unit.18,000 BTU 17 SEER Wall Mounted Daikin Mini Split. The only long beep code is UA. These are new units seems to be wired correctly. any idea ?

[@FullyAirconditioned]

UA is a mismatch of indoor unit and outdoor unit, it could also be a faulty PC board on either the indoor or outdoor.

[@michaelosucha5747]

Ok thanks , have you experienced faulty pc boards on brand new units ? And I see I have ftxng18axvju where the most common part number seems to be ftxb18. Would you know the difference between these two. I can’t seem to find anything online . I appreciate your expertise

[@FullyAirconditioned]

@@michaelosucha5747 I am not familiar with the units you have we don't have that model here in Australia sorry. If it's not a match pair listed in a brochure then I would say that your problem, mismatch of indoor unit to outdoor unit. Go back to where you purchased it from

[@sustachek]

Thank you so much, just fixed the unit in our Air BnB in Madrid with your advice. 🎉

[@ProMace]

*>>> Happy New Year!

[@FullyAirconditioned]

If you have turned off the power then the fault code (if there was one) has been reset. If the units not working there is something wrong, check the simple things 1st, filter clean, power and it’s set to the correct setting. Turn the system on and set at its highest heating/ or lowest cooling setting and just let it run. The fault finding process may take up to two hours to complete, so just let it do its thing. If it doesn’t come up with a fault but isn’t heating or cooling then you will need to call your local Daikin repair.

[@milesabove5259]

Marty, can you please show us some of the Machines that you look at and say ‘no this one is too far gone and not worth my time’? Your ability to come across non running machines that look like they’re ready for the scrap heap, but then be able to get them going with very few new parts is incredible. The kids will love learning to drive a manual in that.

[@greg6925]

My split unit isn't blowing, or heating anymore. Any troubleshooting tips for a solid green light?

[@FullyAirconditioned]

Leave it in and let it run for 2 hours, set it to the highest setting. Your system may be in the process of working out the problem. Like in this video the fault is an outdoor fan is locked ( not spinning) the Daikin’s unit see this fault but doesn’t stop and shut down showing a fault straight away. It tries restart the system 17 times, each time it pauses for 5-8 minutes, goes through its start up process 1-2 minutes, if it detects the fault again it will do this over again, after 17 failed attempts it will lock out and display a green flashing light, if it starts and run fine for 30 minutes it reset the counter to 0. The reason it does this is to overcome nuisance faults, like the fan not spinning dew to high winds, the wind will stop eventually and give the fan a chance to spin normally and the system to operate normally.

[@greg6925]

So your saying to let it do its thing for a couple of hours for it to find the fault?

[@FullyAirconditioned]

@@greg6925 yes

[@valentasliskauskas4814]

Good day, can you share foult list?

[@FullyAirconditioned]

There is a link in the description for the video that will take you to the fault code list

[@jesuskcosta]

How do I tur off the green light in this unit? Is keeping me awake 😢😢

[@kaylawills16]

Wait how do you get it off the 00 mode

[@FullyAirconditioned]

Displayed on the remote, it should just time out after a few minutes and go back to a normal screen. When you test a system an it long beeps on 00 that means there no faults active and the system in normal working order.

[@TommyWilson-g3f]

Daikin 2 year old unit runs for hour trips breaker?

[@FullyAirconditioned]

Could be a faulty breaker, could be under sized breaker, could be so many things, best to get someone to check what it could be.

[@kenlang5961]

Good day sir! In my case my indoor unit are normal! There is no flashing the indicator light are steady but my outdoor unit will start then after a second it will turn off! Only the outdoor turn off!

[@FullyAirconditioned]

It may be trying to restart, some faults will keep trying to over come the problem and try restarting up to 16 times. If the fault is still there after 16 starts the unit will go into fault, this could take 1.5 - 2 hours. Just leave the system on and running for this amount of time and then see if it goes into fault. This is all explained in the video, just watch the whole video.

[@jesusosornio2480]

What if I get a RCV ERROR when I press cancel for 5 seconds. My unit is a Daikin FTXR28EV1B9 I turned my unit off with the manual power button. And I turned it on again and the controller won’t do anything. It will not control my ac unit and it’s just blowing slowly.

[@FullyAirconditioned]

Your AC system is the “Uluṟu Sahara” or the ‘US7” that what it was called in Australia, it has a different remote and it dose some extra things over a standard system. I can control the humidity add land reduce humidity. I looked through the services manual and could find any thing in reference to RCV. When you say you turned it off, was that from the button on the front of the system or an isolator / circuit breaker at the switch board, as this is what needs to be turned off to reset the system. When you turn it on and off from the button on the front of the system it go in to “i have lost my remote mode, emergency operation” and it will run and cool if its hot or heat if its cold, but it doesn’t turn on, on the last setting you had it set to.

[@augustvonmackensen5726]

The yellow light flashes 3 times & outer unit don't run or run with cool air , what shall I do ?

[@ronmaren4135]

Why it didn't double beep at E6 and E1?

[@FullyAirconditioned]

Double beeps let you know that one of the two digest is correct or part of the fault code. If you had a double beep on E6 and E1 then E is the common digit in the fault code. You just need to find the 2nd digit, it will be a number, try the 2nd method in finding the fault code in this video, it brings up more faults.

[@oscure1]

Thank you for your video. Helped me fix the problem!

[@FullyAirconditioned]

Glad to help

[@Billygoatsgrruff]

I have ducted air conditioning. It's been fine until recently. The red power light keeps flashing on and off with an E 3 error code. I've reset it, and sometimes it will run nicely all day, but some days it's a pain. I can't even hear the motor when I go outside. Even when it's on and not flashing, it doesn't seem to cool, and yes we've cleaned the filter

[@FullyAirconditioned]

So it has a red light on the wall controller, then this is quite an old system, at least 15 -20 years. If it’s a non- inverter then the e3 is an activation of a safety switch, hp, Lo, over load compressor, over load fans. You will need a service tech to investigate the problem. But if it’s gas related, like a leak and it’s on the old R22 or R407c gas it’s probably not worth fixing, the r22 gas is banned from being imported and what gas is here is very expensive. With the age of the system, some parts are no longer available, like the main pc board, stocks have been depleted, sorry it’s probably time for a new more efficient ducted unit i would say.

[@Billygoatsgrruff]

@@FullyAirconditioned thanks I'm getting someone out to look at it

[@rameshkrishnan1923]

Hi sir, My daikin 1.5 ton inverter AC works fine at night, but outdoor unit doesn't run during afternoon time till evening, kindly guide us with the issue, climate is too hot here

[@FullyAirconditioned]

@@rameshkrishnan1923 start with a new gas charge and achieving a vacuum below 500 microns before charging with new gas.

[@KrisMamula]

This video was incredibly helpful for me.

[@FullyAirconditioned]

👍🏻 that’s ok, thank you

[@bradroesler7072]

Can you please run us through a normal day of fixing these Daikins?

[@johnblaisdell2179]

Great information. If the beep tone is in your range of hearing

[@FullyAirconditioned]

Just get a friend or family member to to the fault find

[@ShelbyCole-v8u]

What if the unit does beep at all any more even when it is working? Is there another way to know which error code is the right one?

[@FullyAirconditioned]

If the green light is flashing and the unit is not emitting a beep when doing the test with the remote, then you will need a repair company to check it out using the daikin d-checker. The d-checker will display the fault code. My guess is that s mouse has got into the wall cavity and followed the pipes into the indoor unit. In there the mouse has chewed through the small wires to the board that contains the beeper. Take the cover off and see if there mouse poop or chewed cables.

[@FullyAirconditioned]

Once repaired and before the cover hose on fill the hole with “ no more gaps” or some type of filler that’s not to hard to remove, don’t use silicone as it’s a nightmare to remove later.

[@brgarin]

Really helpful! Thank you for your support

[@reedbrett5252]

When I turn on the unit, green light flashes. When I hold cancel however, 00 never comes up. Any ideas?

[@FullyAirconditioned]

Have you tried the 2nd method lately on in this video ??

[@reedbrett5252]

@@FullyAirconditioned Reset the breaker and we're good to go. Thanks!

[@CoolInOlympia]

Thanks so much!!! You are a life saver!

[@Productofgodz]

Mine is flashing but I tried all the error codes none long beep only the heat mode opens the vents

[@FullyAirconditioned]

@@Productofgodz did you try the 2nd method??

[@vanessacisneros51]

My remote says it’s a 00 code but the light is blinking green, the fans won’t open. Any tips??

[@FullyAirconditioned]

Watch this video further towards the end, I give you a second method to find the fault code. Follow that procedure and you should find a fault code 100%.

[@Productofgodz]

@@FullyAirconditionedtried the method and did not find a fault only long beeps at 0

[@FullyAirconditioned]

@@Productofgodz long beep at 00 means no fault

[@sweetgirlden]

What should we do if it says the unit has system malfunction? should there be a specific part that need to be replace or the whole unit needs to be replaced?

[@FullyAirconditioned]

What’s the fault code?? There is a link in the description that has all the fault codes, parts or repair could get the system fixed, but other considerations are how old is it compared life expectancy of the unit. If it’s close to of over 15 years I would be up grading with a new system.

[@sweetgirlden]

@@FullyAirconditionedi appreciate your reply. Anyway, they’ve change our unit because they don’t know how to troubleshoot 😅

[@FullyAirconditioned]

@@sweetgirlden 🫣OMG

[@SachinBhardwaj-en6se]

Which is code of cooling

[@FullyAirconditioned]

Snow flakes symbol ❄️ is cooling.

[@musico3415]

I don't have the remote. How can I still diagnose my Daikin split aircond with green flashing light and not cooling?

[@FullyAirconditioned]

Don’t believe you can, unless you have a daikin d-checker (services tool), have your tried resetting the power to the system ?? If it’s a resettable fault the system will restart. If the fault comes straight back you will need the remote to check what it is. If it doesn’t reset, call your local daikin dealer for a services / repair call out and make sure they have a d-checked so they can check fault code as you don’t have the remote.

[@musico3415]

@@FullyAirconditioned thanks for your reply. My model is 23 years old, but hardly used. So I don't think the Daikin technician could repair it too.

[@FullyAirconditioned]

@@musico3415 possibly time for a new one

[@K_mni]

Thank you Thank you spool much. 😊

[@fragglerocker8316]

My unit’s green light is solid, but the unit is beeping once every 1-3 minutes whether it’s on or off. It is driving me nuts because I can’t stop it from beeping because even powered off it is doing it

[@mateopen8597]

Yesss that helps a lot my fault code is U0

[@TheJulie169]

I don't even have a light blinking. I can't turn it on but the remote works it just won't turn the air con on

[@FullyAirconditioned]

Then it probably doesn’t have any power, have you tried pushing the on button that’s located on the air conditioner??, if that doesn’t work I would suggest there is no power getting to the unit.

[@TheJulie169]

@FullyAirconditioned yep have tried to turn it on there. That makes sense that there might not be power to it. I've tried the power board. I've turned them all off and back on. I'm not sure which one it sits on. Might be the wiring? It did work back in June. But I haven't used it since then.

[@FullyAirconditioned]

@@TheJulie169 there could be an isolator switch outside next to the unit

[@TheJulie169]

@FullyAirconditioned there is a power on off. We've tried that. I looked over the unit itself outside and I couldn't find anything.

[@FullyAirconditioned]

@@TheJulie169 Well if the power is on, and it doesn’t work, then the indoor pc board is possibly dead, you need to call your local Daikin repairer, you have done all the basic checks.

[@Booknotelpo]

Thank you

[@16valve64]

Thanks a lot sir

[@FullyAirconditioned]

Easy 🤙🏻

[@markodeasis5380]

How about it's not beeping

[@FullyAirconditioned]

So the lights are on but it doesn’t emit a beep from the indoor unit, possible a mouse has gotten in to the unit from the wall cavity and chewed through the wiring to the pc board that emits the beep. If you have a close look at the cover where it meets the wall, if a mouse has been in there there will be little bits of chewed foam and stuff. The only other way is if the model unit has indicators lights at the outdoor unit, or call a Daikin services tech and ask if they have a d-checker, this plugs into the unit and connects to their phone and shows all data and faults. Make sure they have a d- checker.

[@michaelhockus8208]

thanks!

[@FullyAirconditioned]

no problem😉

[@jonbri4383]

The remote is like a mini computer... The old days of just putting on the unit with a button. Much simpler…

[@jonbri4383]

Also I was on the job with my carpenter friend … The customer has a Daikin split system on for air-conditioning… I turned the unit on by the remote , down the temperature to 58 it would run a while then automatically go to heat…. Do you think the batteries just need to be replaced in the remote? Thank you for your answer…

[@barrythomas529]

A Daikin was installed the installer spent hours trouble shooting on phone with technician to finally get it going. The technician was on speed dial. About once a month the installer was working on it. The home owner demanded it be replaced. Rather than get a bad rep the installer replaced the Daikin mini split.. with a Stealth i believe..problem solved.. of course he lost a couple thousand Dollars.. The installer gave me the daikin mini split system only charged to istall it.. most screws are lost from being worked on so often. Very unreliable. 5 years old on a 15 year warranty ..think i will just junk it.

[@FullyAirconditioned]

Sounds like the installer has no idea, here in Australia you have cert 2 and cert 3 qualification. Cert 2 are will do as little as a 2 day course, cert 3 do a 4 year apprenticeship. Most people who don’t know what they are doing blame the brand. Daikin units are far more complex with there inverter driven compressors compared to the direct on line non inverter systems, but the push with energy efficiency the old system won’t pass the minimum standard, people working on them will need to up skill. This has happened about 15-20 years ago in Australia. We basically have no non inverter compressors in new systems at all.

[@barrythomas529]

@@FullyAirconditioned no installed my guess a couple thousand or more. Just a lemon . .had a car like that years ago. Called a vega.

[@barrythomas529]

@@FullyAirconditioned oh o forgot he still installs Daikin.

[@salamsaloom2477]

🙏🙏🙏🙏🙏🙏🙏

[@dannytang6671]

Thumb up..

[@barbaraced3198]

and for me too

[@johnkoval8053]

Ac shrine

[@Zeviticus]

This has to be the most ridiculous way of finding a fault code. Who are the clowns who design this nonsense?

[@FullyAirconditioned]

@@Zeviticus each to their own

[@arjunapeiris981]

Nice explain sir. Send your mail Id

[@rameshkrishnan1923]

Hi sir, My daikin 1.5 ton inverter AC works fine at night, but outdoor unit doesn't run during afternoon time till evening, kindly guide us with the issue, climate is too hot here

[@FullyAirconditioned]

@@rameshkrishnan1923 is the unit in fault ?? Not working when it’s hot, could be poor installation, vac pump not use when Installing the system. Refrigeration system has air in it causing a high temperature at the compressor tripping the internal compressor thermal overload, could be short of gas causing the same thing.