THAT DAIKIN U4 FAULT ! BUT DID YOU KNOW WHY ?

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[@stijnvercruyssen4429]

Hi I'm a test engineer for hq for Daikin Europe in Belgium. I've been following your videos already for a while. Good to see issue in real life situations and not only in perfect test room conditions. We will have in mind all your problems you faced, to avoid in the future.

[@hvacuk8975]

Thanks for watching Stijn 🙌🏼 Yes, always nice to see issues in real life conditions ! That sounds good 👌🏼 Appreciate manufacturer’s who listen to engineers feedback and experiences with kit and improve where ever possible 👍🏼👍🏼

[@stijnvercruyssen4429]

@@hvacuk8975 if you need extra help, I can always assist you.

[@hvacuk8975]

@@stijnvercruyssen4429 Thank You 🙌🏼👍🏼

[@stijnvercruyssen4429]

@@hvacuk8975 I also asked our team to watch your videos to learn from it.

[@musakavalci9470]

Some great tips and glad your back!

[@hvacuk8975]

Thanks mate 🙌🏼👍🏼👍🏼

[@richardbartlett6932]

Fair play matey. So glad I'm no longer up on UK roofs getting soaked and freezing 👍

[@hvacuk8975]

It was a bit wet and windy mate 😂🤦🏻‍♂️

[@paulbrown1079]

Got a magnetic dish after seeing one of your videos no more casing screws down between grills ! Great video never seen that cooling application for a board before

[@hvacuk8975]

I love a magnetic dish mate 👌🏼👍🏼

[@electroshed]

Neons on the lil filter board, handy for checking you have all three phases - but can you even see them while the unit is powered? lol

[@allandewar]

I had exactly the same problem at a leisure centre in Southam. All 3 condenser pcbs gone in very new units not long ago installed. Daikon supplied and fitted all 3 unfer warranty, no auestions asked.

[@Shmoobiess]

Hey mate, I've only been in the trade a little over a year but will be doing my cat1 soon, learning alot on the job but after finding your channel a few days ago I've been learning loads. Keep it up mate you're motivating younger engineers like myself 👍🏻 PS - need an apprentice? 😂😂

[@hvacuk8975]

Thanks mate, appreciate the kind words 🙌🏼 Glad they are helping ! Good luck with career, sure you’ll smash it mate 👊🏼

[@andreasgeorgantakis4980]

Good to see you back mate!

[@hvacuk8975]

Thanks mate 👍🏼👍🏼

[@po65231r]

Glad to see your back 👍

[@hvacuk8975]

Thanks mate 🙌🏼👍🏼👍🏼

[@rickchan3789]

Love your videos mate, keep em comin

[@hvacuk8975]

Thanks mate 🙌🏼🙌🏼👍🏼

[@desmondbarker-johnson9771]

Changed a fair few of them, only on the single fan skyair condensers though. Good vid mate 👍🏻

[@hvacuk8975]

Thanks mate 🙌🏼👍🏼 After speaking to some others it seems a lot of the other models don’t have the noise filter on the back so you can just swap the board without taking the frame off but on this model it was hard wired from the main PCB to plugs on the noise filter behind so had to take it off to get to it 👍🏼👍🏼

[@adamdebelle5819]

Brilliant videos mate, love this game

[@jobertpage-et1349]

Nice one troubleshooting sir...

[@darpac5969]

Good too see you doing a video again. Loving your magnetic dish mate, can I get one?

[@hvacuk8975]

Thanks mate 🙌🏼 Hopefully getting some more made up pretty soon so keep an eye out 👍🏼👍🏼

[@craigladewig3158]

Bring back simple contactors with simple controls please, this week replaced 3 LG inverter boards shorted out by geckos , had 2 Daikin boards with U4 and 2 Samsung boards. The money saved in power consumption is spend on pcbs when they go

[@hvacuk8975]

I’ve still got some old fixed speed 22, 407 kit running that never misses a beat ! Don’t think it will ever die 😂👍🏼

[@rdenir]

I have a 35 year carrier unit and the only thing I have replaced on that is a reversing valve coil. I upgraded the Thermostat to a universal electronic controller just on 20 years ago and it has never missed a beat yet I installed a Daikin 3.5 Kw split 2 months ago and the Outdoor board is faulty and being replaced under warranty..

[@sjefoekel6058]

Its called progress, but not to worry things are going for the better, maybe not so good as yesterday but sure better than tomorow🤔🙃😩

[@mgabrielle2343]

Too right, where is the sense in replacement boards costing £800. Sure there must be a particular component that fails that can be repaired or replaced by anyone with good soldering and disordering skills and little knowledge in electronics..

[@Horizon301.]

What are your thoughts on Mitsubishi Heavy Industries wall mounted units?

[@mradam4430]

Have probably had three of four R32 ‘Advanced’ OU showing this u4 fault after just a few months, narrowed it down to OU PCB and replaced under warranty but didn’t know it was a known issue. Bit frustrating especially the ones that aren’t local but replacements sent quickly. Import duty charged on the latest warranty PCB but again Daikin sorted that quickly. miss matched units there must be a legit high sensible combination.

[@hvacuk8975]

Think there was a bulletin floating around somewhere about it showing the specific model/serial numbers mate. This one was a two hour drive away 😅

[@harrycallaghan2531]

You do great videos mate. What advice can you give for an Electrician who has just done the 2 year course at Willesden college and looking to get in the game. Do firms expect you to be all singing and dancing or are they reasonable and willing to train one up? Any advice appreciated gezza

[@brendanmurray6836]

Hey bud hope you're well, another cracking video. Can I ask what you used to download the manual before you started please? Is it a programme or app. Cheers big dog

[@mikesolari1939]

keep the good work up

[@hvacuk8975]

🙌🏼👍🏼👍🏼

[@Tcmairconditioningservices]

Changed my first one on a single fan the other day, bit of a pain but fixed my u4 fault! Good job mate!

[@deanharris9331]

I've had the same thing happen to me, eight split units (R32). All of them went into u4 fault after about eighteen months of being installed. I'm gradually working my way through the pcb's and replacing the suspect capacitors.

[@hvacuk8975]

Are you changing the capacitors through warranty mate ?

[@deanharris9331]

@@hvacuk8975 No...apparently the company that installed the units are no longer going. We're still in talks with Daikin where we stand with the problem, but from what I understand it could cause them a bit of a problem as Daikin have sold thousands of these systems. I think they've got a few dedicated field engineers that purely travel around just replacing those capacitors. I ordered about a dozen of those capacitors (kept a few as spare)and just soldered the last one in. Some units did not show a u4 fault but i was not getting any reading's back from the OU thermistors on the wall mounted controller .....which apparently Daikin said is another sign that the capacitor is faulty. Great channel by the way 😊👍

[@agnisinatria3520]

I also have the same problem here with the suspended type split unit R32. From all 12 units RZF125CVM4 installed, 11 have U4 fault some after one year, and the rest after 2 years. Looking to the one of the outdoor PCB, the blue capacitors 0.47 uF have lower values. I think Daikin need to recall the PCB units from customer to replace those capacitors.

[@awaisshahid2625]

​@@deanharris9331did this work mate did u manege to resolve the u4 errors

[@ukacservice1318]

I find it alot easier to change the board itself rather than the metal back plate aswell. 10 minute job. Have done 10-15 so far. Little heads up aswell, panasonic have a similar issue on their R32 100 units inverter boards, throws a PH29 . 👍

[@setvencarter2752]

I'd agree with you about the board it's self, daikin love cable ties😁. Had a few panasonics do a P29 on me straight from installing too.

[@hvacuk8975]

I did plan on doing the board only but couldn’t get my hands behind to unplug everything off the noise filter ! After speaking to some others it seems a lot of the other models don’t have the noise filter on the back so you can just swap the board without taking the frame off but on this model it was hard wired from the main PCB to plugs on the noise filter behind so had to take it off to get to it 👍🏼👍🏼 Got fat sausage fingers 😅 I haven’t heard of the Panasonic issue ! Nice one mate I’ll keep an eye out for it 👍🏼👍🏼

[@ukacservice1318]

@@hvacuk8975 yep one of the plugs can be a bit of a pain on the noise filter, bottom left when looking from above. That's the only issue I've found. Definitely need a syringe for the heat sync too. Makes life so much easier.

[@ukacservice1318]

@@setvencarter2752 yeah, the fault leads you to think the comp is locked. Inv output is rubbish on them aswell I've found. Can't 100% say if good or not. Will give power for a split second then nothing.

[@EverythingHVACR]

Nice video man!

[@hvacuk8975]

Thanks mate 🙌🏼👍🏼

[@neilvestervictor180]

great work

[@hvacuk8975]

👍🏼👍🏼

[@FriotecAVAC]

Sometimes it happens between 2 year

[@kcomfortsystemshvac7060]

Hi,,,mate,,,,,weather in Birmingham,,,rain,,,,!!,,, always good performance,,,,,,, always I will get good knowledge,,,,,,,,😀😀😀

[@teknics8853]

Good evening sir how to repair pcb board of daiken u4 error.

[@jdjavedvlogs222]

Brother what is the scope of hvac in uk or good or bad how to apply for hvac working team details about tha please please

[@redfoxsocial52]

I see that you aren't using video timestamps. This is a really good way to improve your ranking on YT, you should consider it.

[@guitaristgary]

Just discovered your vids, rhyere great! Do you just use your phone camera to video the footage?

[@hvacuk8975]

Thanks mate 🙌🏼 A lot of the time yeah, I have got a GoPro I use too. Depends what I’m doing 👍🏼👍🏼

[@ADP_Artisto]

All in one noice filter, inverter, control, overvoltage , voltage Earthleakage , all huh nice

[@JuanTodoli]

Every single one PCB with the same problem?

[@Harry_hvac_irl]

The last main pcb I replaced under warranty the new pcb wouldn't engage the coil for the 4 way valve. Took a lot of convincing to get daikin to send another. Also how bad is it the way they send the heat sink.🤣🤣

[@hvacuk8975]

Mate !!! Heat sink in a bag ! 🤣🤦🏻‍♂️

[@Harry_hvac_irl]

@@hvacuk8975 joke. How is a fella ment to get it out... end up with more on your hands then the pcb.

[@dongwong469]

Hey man (great videos) With the faulty caps on the boards , will there still be a signal down the transmission line because of the bad caps?

[@Hoppa12345]

I repair these pcb's many times. there are a few issues. Communication works. But no operation at unit. No communications with still power on signal. and very weak signal ... All of them are resolvable with replacing ALL the caps on the board. not just 1 or 2 .. Everyone of them.

[@NorCal-refrigeration]

🤘⚡️🤘✨

[@hvacuk8975]

Thanks Dave 🙌🏼👍🏼👍🏼

[@sterlingarcher46]

Bro where did you get the magnetic umbrella ? I've been looking for it but can't get my hands on it . Seems like you guys across the channel get way more of the good stuff than we do eh !

[@hvacuk8975]

Got it from a wholesalers called Derbyshire Refrigeration mate ! The most money I’ve ever spent on an umbrella 😅 but hoping it will keep me dry doing things like this 🤞🏼👍🏼

[@joshnewton9277]

Did I spot the supco umbrella at the end there? If so where did you get that from? Been making do with a homemade version of a magnet and sportsworld umbrella for a while 😂💪🏻

[@hvacuk8975]

Well spotted mate, the most expensive umbrella ever I think 😂 I was hoping to show it off but it stopped raining 🤦🏻‍♂️ I grabbed it from Derbyshire Refrigeration mate, think they’ve just restocked too 👍🏼👍🏼

[@joshnewton9277]

@@hvacuk8975 love my gadgets mate! Wera zyklop next for me but can't decide between 1/4 or 3/8 🤔 cheers for that though I will check them out. Will be worth the money on that one day that you dont have it! Especially fault finding in the rain

[@hvacuk8975]

@@joshnewton9277 definitely 👌🏼 I’ve got both the 1/4 and 3/8 Zyklop mate. The 1/4 is the one I grab the most for VRF/Split repairs but the 3/8 is a good choice if you need to go up to 17/19mm too 👌🏼👍🏼

[@nitishtripathi6426]

Daikin Vrv 3 in showing error code U4 How to solve

[@alireda4441]

The R32 on the panel at the beginning of the video indicates the refrigerant R32?

[@hvacuk8975]

Yes 👍🏼

[@Eastdurhamenduro]

Where are you getting the manuals from bud?

[@hvacuk8975]

To be honest mate most of them just come from a google search 👍🏼👍🏼

[@adrianfarhan2659]

Are you working with daikin?

[@airmensystemscontrol1270]

Hi Mate! Where is the reason because all those Pc has gone? Highly voltage?

[@airmensystemscontrol1270]

Ahh Sorry! Thanks for the video

[@hvacuk8975]

Faulty capacitor on the Main PCB comms circuit which drops the comms voltage causing a U4 error 👍🏼👍🏼

[@slawekjurek11]

@@hvacuk8975 I have the same problem as you describe in your movie and the same motherboard. Can you tell exactly which capacitor or capacitors I need to replace?

[@leewilson6635]

Mitsi all the way!

[@rafaeltarragamora8399]

The guilties from this failure, are the blue capacitors . Remplace its.

[@christiansommer914]

Are you self employed or do you work for a company?

[@hvacuk8975]

I actually work for a company mate but look after myself so it’s pretty much like working for myself 👍🏼👍🏼

[@maracservices]

No video mate 👌🏻

[@ADP_Artisto]

It also used for DUCTABLE

[@dantheman9909]

Had loads of these go bit embarrassing really.

[@hvacuk8975]

👍🏼👍🏼

[@ADP_Artisto]

U4 is communication error

[@ADP_Artisto]

Hey man u changed pcb u need to do test mode now

[@ADP_Artisto]

Hmm its smart vrv

[@ADP_Artisto]

This pcb is very advanced all pcbs in one pcb ossom

[@ADP_Artisto]

If u3 showd then u have to do test mode

[@user-bf5so9dl7d]

replacing pcb in a rainy day? good luck with that.

[@ADP_Artisto]

Daikin cord it remote

[@ADP_Artisto]

Eey man this is not vrv

[@armandosairally]

Silly question where are you tethering yourself too??

[@hvacuk8975]

There is a man safe system which is basically like a steel wire that runs around a couple of meters away from the perimeter of the roof. That’s what I was clipped onto mate 👍🏼👍🏼