Mini-Split Running CONSTANTLY! 6 Reasons Why!

HVAC ductless mini-splits can sometimes run longer than expected. In fact, some never turn off at all. In this video, we go through six reasons why a ductless mini-split may be running longer than you expect it to. So whether your indoor ductless mini-split or outdoor side discharge HVAC unit is constantly running, go through the six reasons to understand your unit better and maybe find out if it is operating properly or needs a repair from an HVAC technician!

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----------Chapters-------------
0:00 Intro: 6 reasons Mini-Split Running Constantly
0:17 Mini-split inverter HVAC system operation
1:10 Remote control settings
2:07 Some ductless systems never turn off
2:38 Cooling hardware components
3:22 HVAC tune-up needed
3:59 HVAC repair needed
4:45 Have more to add?

#ductless #minisplit #mitsubishi

[andygarcia]

Thanks for the help I was scratching my head as to why the indoor fan was running so low lol

[anthonyspadafora]

Theoretical perfection in heating and cooling is when the unit is only supplying what is being lost. Boilers and ductless are well on their way to doing this. Boilers are at a 10 to 1 turndown and ductless, because they do not need to maintain a static pressure for balancing, are also getting close to infinite turndown. Early Sanyo units used the remote as a thermostat that had to be in eyeshot of the unit to work. The Comfort star units I install give you a choice, you can flash the unit with the remote and put the remote in a drawer, it is no longer needed. Because the unit is now taking its measurement from the thermistor in the unit, the indoor fan must be on continuously in order to get a true room temperature. Even in a power outage it will restart and go to the last setting. You can also use the "Follow me" button and turn the remote into the thermostat but once again it must stay within eyeshot of the unit to work, this is often used when they are placed on a higher wall. This will allow the unit to run until it gets to the actual temperature that the remote is sitting in. The new high heat Comfort star has a snap out blower. This is a major innovation because squirrel cage blowers tend to get packed with dirt and having them cleaned is expensive. This is one of the reasons I use cassettes whenever possible as they contain radial fans that dont build up dirt and are quieter, unfortunately they cant be used everywhere. Also I would like to point out that there are two "Auto" on the remote One is like you said to let the unit pick the proper fan speed so it can adjust to the load the other that confuses people is an automatic switchover from cooling to heating. People get in trouble with this on multi units if one unit is in a warmer or cooler room like a kitchen. These units can not heat and cool simultaneously like a three pipe unit. It is either one or the other and if one unit switches to heat while the other switches to cool you will pull an error code. So make sure you are setting the auto for the fan not for the unit. I was cleaning the units I installed but have recently given my cleanings to a guy that is specializing just in cleaning ductless, he is becoming quite good at disassembling all the different brands and is doing quite well. In Australia where these units have been around for many years they have franchises that do nothing but clean ductless units. This is definitely a good job for someone who is careful and meticulous to get into as most HVAC techs really don't care to do this.

[Keymaker]

If your system is working correctly it’s not supposed to turn off unless you turned it off, it’s supposed to ramp down and keep you comfortable. My first month with a mini split I got hit with a 600 bucks power bill cause I keep messing with the thermostat thinking something was wrong. The following month I left it alone at a set temperature and my power bill has gone down at an average of 15% every month compared to what I used the previous year.

[Nixme]

My new Daiken minisplit seems to run all the time.

[MsVictory]

Hello! I finally had a mini-split (Daikin) installed this winter and don't really know the best/most cost effective way to run it. I basically only want to use in really cold winter and really hot summer. I heard you should not turn it off, so what is the best method to use when needed, but not waste $$ when not needed. (Did not really come with a manual, just one big sheet) Thanks so much from Maryland USA!

[nightcat]

2:08 exactly what I'm dealing with. Heat fan will cut off but AC fan won't cut off. Is there something I can do?

[tbengs]

Thanks for a good comprehensive list :)

[johnnytuinals]

Just looking at my Daikins that I installed in Jan 2022.The Units work great, But looking at the outside Mini-Split I see a few leafs on the side and in the back of the unit.So I started picking them off of the unit so I will hope not to have a problem...Just wondering would a LeafBlower be Wise to use on the outside to blow away if there is any dirt or whatever I don't see on the outside coils???Just trying to keep the outdoor unit as clean as I can...Thanks

[Van_frederick]

I have a Panasonic mini split inverter ( no heating ) 12k btu, i sleep with the ac set to 26c, sometimes when im off to work and my wife is asleep i see the condenser fan is off and i hear no compressor noises, and sometime i say it slowly start back up.. i am guessing this is because of the relatively high temp i am setting? i live in the Caribbean so night ambient temps outside are around 23-28c?

[conoor]

my new aux ac mini split the outdoor unit won't stop running what should i do?

[markholmes]

I just installed a Royal Bear 12000 btu 110v unit in my 3d print farm. the outside unit cycles off perfectly when the desired temp is reached, but the fan on the inside unit runs 24/7. I read the manuel several times, and tried every setting but it just keeps running. I see now in your video that this might be normal, and by design. (seems dumb to me) is there a hack that will allow me to get the inside unit to cycle off as well? I've even considered putting a thermostat on the wall power supply to turn it off and on... help please.

[chrisd]

Thing is with a Mitsubishi multi-split setup. I discovered that the inverter cannot throttle the BTUs down as low as it would be able to with a mini split. The lowest BTU output is set by the outside compressor which is high enough for my bedroom units that it cools them down quickly, the fan keeps running and redistributes all the moisture from the coil becoming a humidifier. So I'll have 70° with 65% humidity in this My workaround was to get one of those Cielo breeze controllers, set comfy temp so that when the compressor shuts off so does the fan.. Now I have 70° and 45% humidity...

[jhonb]

I just installed a Costway Mini Split. The fan for the indoor unit will run 24/7 when it is set on A/C no matter what mode the fan is set on. Even if it is NOT calling for AC. I was worried because this unit also drops the temp well below what I set it (7 or 8 degrees) I wish I could install a wall mounted thermostat for this. If this was in my house, I would have an issue living with the fan running 24/7 but since it is in my garage, its ok, but I still think it is a energy waste. And I wish they had included this info in the directions as I thought there was an issue. Your video made me feel better about it.

[soloyose]

Question ❓ can I interchange the indoor unit for a different brand?? Like a pioneer for a premium brand, whit the same BTU 18000 same voltage ⚡

[donnadavis]

I am wondering, which setting on these units are more finaically cheaper, should you leave it on automatic or on the coolest setting. I have a 18, 000 BTU and I am only cooling one small bedroom, on the coolest setting it gets to cold and I have to turn it off, then back on. I set it at 30 and I live in Europe so the temp. setting may be different than in America where I am from. If I have it on Automatic it doesn't seem to get cool enough, this is also a new unit. I just need to know which setting is the most economic way, and which is beter, to trun it off when it gets to cold then back on when it gets to warm, the unit never shuts off automatically. 🙃🙃🙃

[Eris_Greyrat]

I just installed a new Daiken mini split and I will set the set point to 72 on heating and it will heat it past 80 in the room without shutting off. Turn it to 70 and it will finally shut off. Same in cooling. I'll set the set point to 68 in summer and it will freeze you out of the room with the temp lower than 62 in there. I've been with Daiken tech support for 2 months on this and the things they have told us to try or replace haven't fixed the problem. The home owner is starting to get impatient. We're about read to eat the unit and throw a different brand on there for free. Any suggestions?

[Kccb]

I have two Lennix indoor wall-mounted units connected to one outdoor unit. One of my units produces way too much humidity even though I’m in Auto cool. The drain line has been verified clear. It’s been cleaned and serviced. I am not sure what’s causing it.

[TheRCinsanity]

Hey man, good video, you mention you can think of a brand of mini splits that do not turn off in AC mode. I have a Costway unit that will completely shut off in heat mode. But in AC mode, the outside until will shut off, but the inside unit will keep running. Curious on what brand you were talking about!

[newday]

I have a della and when I put it in auto mode it sets at 77 degrees and I can change it. In cool mode at 74 it just keeps running.

[danc]

I will pray for your daughter as I do for every child. God hears all and He has His own agenda which we as parents sometimes question. Pray and believe and all will come into focus. God Bless.