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?

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.

Hello,

I have a Daikin 36000 BTU 4 port compressor model 4MXS36RMVJU that has 3 of the old style air handlers connected to it: FTXS09LVJU 9000 btu and 2 x ctxs07lvju 7000 btu. Compressor is one year old and one of the air handlers is 6 months old. They work great! They were installed by installer A.

We recently added a new room to our our house and in the process added the new fancier looking Emura FTXR12TVJUW to the system taking up the 4th port. This was installed by a new person who primarily focuses on Fujitsu mini split systems since installer A went radio silence. Installer B was recommended by the contractor who built the room addition.

In the winter, we tried to use the new air handler for heat mode and got an A5 error just like this video https://www.youtube.com/watch?v=9FDvBT841gU. I reached out to a friend who works for Daikin in a different state at the corp level and he said " A5 on an indoor unit is usually a bad thermistor on the coil, but It could be a bad control board (not recognizing the input from the thermistor). " We decided to use the electric fireplace for the few nights we needed heat and didnt get anyone out to look at it. Now its getting hot and we want to use the AC. Whenever we use the new handler (FTXR12TVJUW) for AC, it will turn on the fan, doesn't blow cold air and then eventually we get an E5 error on the unit. All the other units report the same error. At this point, none of the air handlers will work.

If we pull out the disconnect and plug it back in after waiting a bit, all the original air handlers work great for AC. If we try the new one, we get the E5 error again that effects the whole system. AC installer B came out and checked freon levels and it is in spec. He could not figure out why it would not work.

So, given that we are getting an A5 and an E5 error and my friend stated it could be a bad thermistor, would that also affect the AC mode as well? At this point do I reach out to Daikin directly and try to find a Daikin specialist?

So I got a no heat code for a Daikin air handler/ inverter heat pump. It gives me an e5 open fuse code. I checked all the low voltage for a short, communication plugs looks good, and the fuse is not infact blown it’s fine where should I go from here

I have a 23 years old Daikin ducted air-conditioning system which has stopped working today. The thermostat shows an E5 error message, but the manual that was provided with this unit doesn't include a list of error codes

In my experience, air conditioning systems are not usually repairable, but before buying a replacement I'd like to check which error is that (just in case it is one of those rare cases in which it can be easily repaired). According to the manual, it is one of the models shown in the image (they share the same manual)

Do you know what does E5 error code mean in those units? (According to the documents I've found it generally means overheated or blocked external unit motor, but it may mean blown fuse in the external unit in some models)

We used to have 3 Fujitsu ductless mini-splits connected to one outdoor unit installed for the house. The units were permanently damaged and became useless and have been in our home unused for years. This summer, we decided to see if we could buy 3 indoor units and one outdoor unit to replace the old ones while still using the old wiring and tubing from the old Fujitsu installation. We asked an HVAC guy if it was ok to mix match wires/tubes from different brands and he said it was perfectly fine and should work. We wanted to do this because otherwise, we would have to rip out all the wires and tubes within the walls and replace them with new ones.

Fast forward to today. We've had the Daikin units installed in the house for a few days and it has been barely cooling, then not cooling at all with just the fan working, to then shutting off and giving an error code of UH/A5. In the manual, it says that this error is due to the antifreeze function kicking in. Today I realized that the new copper tubing from the pump and the old Fujitsu copper tubing within our walls do not match in size and could be contributing to the pipes freezing. When the HVAC guy first saw that sizings of the pipes were different he seemed surprised and that worried me but he still proceeded with the installation. Since the pump comes with a larger pipe and the old pipe is smaller in diameter, I think the pump is giving out more volume than the old pipe can handle, causing it to freeze up and causing the antifreeze function to kick in. Can anyone confirm if mismatching tubes and wiring between different brands is causing this issue? Our HVAC guy is very stubborn so he hasn't been receptive to our worries and had been saying that it's an issue with not feeding enough current to the system and does not mention anything about antifreeze. He tried several different things to fix the issue the past few days but every time he leaves, the system shuts down with the same antifreeze error.

Hey guys. Looking for a little help hopefully.

I just recently purchased a new home (new to me, not by build date) that included 2 daikin 9k btu mini splits. Both mini's are attached to the same outdoor unit.

So here comes my question. One mini works perfectly while the other is having issues blowing cold. My wife and I are trouble shooting and realized that the coils within the head unit of the non functioning one isn't cold, while the one blowing air at 78 feel very very cool.

So I guess my question is, what could be causing this? I have cleaned all the filters so that's out. They weren't dirty anyway. Could the line have a block? Could it be frozen somewhere from the outdoor condesor to the unit? We know the condesor isn't the issue just from the other plit working. Additionally the malfunctioning units fan does blow, so I believe the fan within the unit is funcrioning

Any guidance? I would love to not wait a week for a tech to come out and of course have the unit be working.

Thanks everyone!

Hey, I have a dual split system with one outdoor condenser unit (2MXS18PMVM) connected to two indoor evaporator units (CTXSO9PMVM5), installed in separate rooms. One of the indoor units started displaying the error code "UH". The other unit is showing an error code "A5". I can't turn on neither of them. Currently there's quite the heatwave where I live, so something might have overheated.

My immediate attention is on the unit showing the "UH" error, as it's where I sleep (the other one is in an empty guest room). If I were to temporarily turn off the unit showing the "A5" error (which I read it might be a problem on the indoor heat exchange of that unit), would it allow the other unit (with the "UH" error, which afaik is a communication/transmission error) to turn on? I'm hoping to at least get the ac on my room running properly until I can get professional help. I'm wondering if anyone has insights into what might be causing these errors or how to fix the one in my room until I'm able to schedule technicians to come look at it

EDIT: After turning on and off all of my apartment circuit breakers, I could the on in my room on, even though it doesn't refrigerate, just ventilate... And the other one is showing that it has the "C4" error