Mini-Split Running CONSTANTLY! 6 Reasons Why!

[@MsVictory1945]

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!

[@10yoss]

How about a bad temperature sensor? I have a brand, you Senville 18K btus with an inverter. The unit will keep running as long as it on (heating or cooling) passing the set temperature by many degrees. Correct amount of refrigerant...I replaced the control board of the air handler...did not make a difference. My last hope is the temp sensor.

[@grassmastersllc2558]

I can't get a set temperature, I'll set it to 70 degrees in auto, cool, or comfy and it just keep blowing cold air down into the lows 60s, only way to stop that is to shut it off.. what's up with that as I read this is a common problem

[@anthonyspadafora1384]

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.

[@Nix4me]

My new Daiken minisplit seems to run all the time.

[@enlightenedhummingbird4764]

So does my Lennox. We have an old one that does not do this. Seems this is a downgrade from one of their supposed "upgrades"...? It's crap.

[@chrisd4432]

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 summer..... 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...

[@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?

[@marzgtp]

Hello, I have a new Daikin mini split and it doesn’t turn off? Is it normal? Should I set it to Auto?

[@HomesteadOnThePreserve]

I have a 2021 GREE Mini Split and when set to COLD it never shuts off. (fan will completely shut off when in HEAT mode after reaching set temperature however) When set to COLD and the compressor shuts off the fan will continue to run which it's supposed to just like the guy explains in the video. The setting AUTO is the fan speed and yes, keep it on AUTO for the best efficiency.

[@donnadavis1538]

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. 🙃🙃🙃

[@Lili-xq9sn]

I'm new to this too. So far, watching my energy usage daily. It takes more energy for about the first three days it's on to build up the pressure. After that my energy usage has been lower. My units are always on, but they deliver the temperature they are set at. Maybe set the fan to auto. (If you only have 1 unit, maybe try that on auto. But you can't use AUTO MODE if you have more than 1 unit.) Also, often the remote is the thermostat. Be careful where it is in relation to the unit. I like a very cold bedroom, but need it warmer in the day. I set it at 63° night, 68° day. Maybe you should ask a technician if yours are working correctly.

[@1Keymaker]

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.

[@enlightenedhummingbird4764]

Constantly running is too drying for this old body, sadly.

[@Bluntedco.]

So you are saying eco mode turns it off and cost more to run vs leaving it on?

[@Reeses0810]

If living with a jet engine in your face all day is efficient I will stick with my old gas heater

[@johnnytuinals9046]

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

[@NewHVACGuide]

I use my leaf blower to clean off my HVAC units sometimes 😃

[@robind8164]

Hey guys, i have a fugitsu mini split 5 zones unit. Can I have it set on auto on one head and dry mode on another head at the same time without damaging?

[@Lili-xq9sn]

​@@robind8164 no. They must be in the same mode. In other words never use auto MODE, but use Auto on the fan speed.

[@USA-GreedyMenOfNoIntegrity]

The reason the indoor or outdoor units turn the fan on, is to pull air across those junk thermistors. You know those electronic devices that fail all the time.

[@NewHVACGuide]

Your view on this is my life pal. haha

[@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?

[@techadka]

Same here with my Mistubishi mini split. Set it at 78, rooms get hot, does not start cooling unless I give it a nudge with the remote. Sometimes it starts cooling automatically, but it is really annoying that I have to keep the remote next to be to lower the temperature for it to finally start cooling. Maybe the temp swing is too much like 1.5/2*F before it turns on, idk how to change it.

[@enlightenedhummingbird4764]

Don't swap it with a Lennox... Blows continuously, no matter what settings I use. Super drying to the body. I hate it.

[@chagodlee]

Your remote is the thermostat. Try placing the remote in a different area in the room.

[@Lili-xq9sn]

​@@chagodleeexactly

[@Kccb68]

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.

[@r410a6]

Then put the mode in humidity mode and see what happens

[@enlightenedhummingbird4764]

The cause is that it's a Lennox. Same issue here, among others.

[@Lili-xq9sn]

All units must be in the same mode. This is why auto MODE should not be used. But AUTO fan speed is more efficient.

[@soloyose5791]

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 ⚡

[@brianellinger6622]

I die in my seventies but I guess I hope that I heard that I get off at 50

[@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!

[@chrisd4432]

Ideally it would work the other way if you have a hot humid summer. My Mitsubishi's run continuously once temp is reached in both modes. I have a controller I bought on Amazon that shuts off the fan when the temp is reached in cooling mode. So it doesn't redistribute moisture off the coil and make the room humid. In heat mode I want the fan to keep running

[@TheRCinsanity]

@@chrisd4432 Got it, do you know if that controller would work for a Costway? Or do you have a link to the controller you’re talking about?

[@chrisd4432]

@@TheRCinsanity I haven't checked their database but both Cielo and Sensibo have a large database

[@TheRCinsanity]

@@chrisd4432 Gotcha, I am looking at getting the Cielo Breez Max, just wanted to check to see if this is a.) what you have and b.) this model will allow me to do the same thing (turn the fan off on cool mode when set temp is reached)? Thanks man!

[@chrisd4432]

@@TheRCinsanity I'll try to check the database to see if it'll work for you

[@hauk3839]

What mini split inverter window unit would you recommend. Saddle or inset. Thanks

[@NewHVACGuide]

I'm not as familiar with those. Window units have always been a lower quality and I would recommend at least looking at doing a wall hung mini split before doing a window unit. I know window units have come along way, but that's still probably the route I would go.

[@Zoyx]

How does the thermostat work with a mini-split? Is the thermostat in the indoor unit, or is it on the remote? I have a Tosot.

[@NewHVACGuide]

Depends on the brand and product. I'm not familiar with that brand

[@robind8164]

Hey guys, i have a fugitsu mini split 5 zones unit. Can I have it set on auto on one head and dry mode on another head at the same time without damaging?

[@NewHVACGuide]

I did a video recently on this exact topic that you should check out. Most multi zone systems cannot be in different modes and operate properly. Although this would not necessarily create damage to the system, it will usually just not operate at all, if the systems are in different modes.

[@MichaelZachary-y6b]

I have a Prime 24k cook only mini split hvac tech installed yet the outdoor unit will not turn off & if I turn off the indoor unit the outdoor high side will start to freeze over. Any thoughts?

[@johnnycarrillo6756]

Did you figure this out?

[@karlpatch4146]

I have the same problem with mine the compressor will not shut off and if I turn off the inside unit it turns to a block of ice inside. I end up having to flick the breakers on and off sometimes it will finally go back to working normally for a while then it does the same thing later on. The compressor will not shut off outside. I think prime is just a piece of crap unit made in Mexico comes with no manual And it's almost impossible to find any information about them online

[@Lili-xq9sn]

Mine has an RFP setting. [Freeze protection]. For if you go on vacation....or turn them off in the house.

[@newday8172]

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.

[@HomesteadOnThePreserve]

You may have the same situation as me. The temperature set on the unit makes the house way colder then its set at. Example, the mini split is set to 79 but it cools the house to 74. If i set the temp to 74 it would make the house 69. My old house with central AC had an adjustable thermostat that could swing 3 degrees. Meaning i could add or subtract 3 degrees to the thermostat that the AC wouldn't recognize. If the mini split allowed me to do that I could set it to 76 instead of 79 and it would cool to 74 by using the example above. If it could swing 5 degrees that would be perfect because then the house would cool to exactly what i set it at.

[@Garth2011]

"Inverter" also means DC electric motors, correct? If yes, DC runs much more quiet than AC as the "60 hz cycle" is not present in a DC motor.

[@NewHVACGuide]

What is an inverter in HVAC? An inverter air conditioner uses microprocessors to control the speed of its compressor motor to match the required output. Once the room is cool or warm, an inverter air conditioner lowers the speed of the motor to save energy and maintain the desired temperature.

[@HomesteadOnThePreserve]

@@NewHVACGuide The best explanation I ever read, great job!

[@EPeltzer]

The long and short of it is "inverter" units use variable speed motors on the compressor, and to drive the air handler and outdoor fans as well. It's actually a confusing terminology to use, not sure why they use the term "inverter" because that usually denotes taking DC and turning it into AC. Yet the source current for all of these HVAC units is AC. This term is often used in solar energy or RV equipment, where an inverter takes DC output from a battery or a solar panel and turns it into house current at 120 AC. So in trying to clear this up I probably just added to the confusion sorry.

[@HomesteadOnThePreserve]

@@EPeltzer Well spoken E.P.

[@Garth2011]

@@EPeltzerSo true, an engineer corrected me once when I used that inverter term on HVAC. We both agreed that AC should be converted to DC at the main panel of homes and run everything on DC, lights, motors everything because DC is more efficient than AC but it cannot travel the distance of AC which is why its being used mostly. We have garage door openers, washing machines and dryers that have DC motors in them and they are so quiet !

[@Garth2011]

Read the manual? I'd bet that over half the people do not. That is their problem and its simply stupid not to because there is always going to be something in the book that will inform the owner of something they didn't know. To ignore reading the manual for anything new to the owner is just plain dumb.

[@rissastephens9504]

I have thoroughly followed instructions and perused the manual. Nowhere’s does it address the running constantly, normal issue.

[@HomesteadOnThePreserve]

@waters65 Can't read, walk or talk. O' yeah, ride a bike either.

[@kyleglover2353]

Why will cause a mini split not to ramp up or down. I worked on one today and the blower would only run at high speed no matter what I did. It would not ramp down? Someone please help me

[@Reeses0810]

Samsung has no manual just vids that say how wonderful not

[@sebaguilar9428]

Thanks brotha!!

[@thebigdoghimself]

I have a mitsubishi 4 ton hyper heat unit with two air handlers. I hate the oem wall thermostats, (I think they are a par33 or something like that) I set them to 71 and they never seem to hit 71, it's either way too hot or 69 degrees but never comfortable. Will the new ecobee premiere thermostats do a better job? Or is there a better alternative?

[@theoutspokenengineer]

Hey, they work on a degree PLUS OR MINUS the set point. A bit like a "sign wave" Perhaps set the fan speed to a speed 2 or 3 and it will be just fine ;)

[@thebigdoghimself]

@@theoutspokenengineer I understand, it just seems like if I set it to 71 (with fan set to auto) it never makes it past 69. Then, if I set it to medium or high fan it over does it and the house is super hot. The system is 18 months old and I can't seem to keep the house comfortable.

[@sd0753]

An ecobee will turn the variable speed unit into a single speed unit, which will ruin the efficiency. Take a look at where your thermostat is located. If it's on an exterior wall it will be influenced by the external temp. Also make sure the unit doesn't directly blow on the thermostat

[@thebigdoghimself]

@@sd0753 HI, thanks, it's in tne hallway. I have 10 airthings sensors in tne house including one next to each of the two mitsu thermostats. The airthings are very accurate, my problem is the mitsubishi thermostats are displaying the correct current temperature but just don't react to keep the temp comfortable. (in both heat or cool modes). For instance, yesterday I'm in my office, and suddenly I realize it's freaking hot. I check the thermostats, it's set to 70 and it clearly recognizes that the room is 75 yet it's still pumping out heat! In settings, I have thermal fan set to low in cool and off in heat. Fan is set to auto, dealer just shrugs his shoulders, how can 75 be acceptable when heat is set to 70? As a side note, I do have it set to use the thermostat for temp reporting and not the one in the air handler, we've gone through all of that.

[@ryanhawkins1235]

@@thebigdoghimself Being in a room with the door closed can also cause the temp to get off from the rest of the house.