Mitsubishi Ductless Split Shut Off on OverCurrent Faults
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- čas přidán 25. 01. 2019
- I am working on a Mitsubishi Ductless Split that has gone off twice on overcurrent. It turns out the days it went off on overcurrent. The days it went off on overcurrent the morning started off around 15*F. The compressor was trying to slug liquid refrigerant and lock restored till it locked out. I found the sw1 preheat control function was turned off so I activated it. This works like a crankcase heater.
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You did everything you could. Looks to me like you are very good service technician so keep up the great work and I really like your videos
Mistsubishi in heat mode should be 415 psi at the ten minut to 12 minute mark from when the compressor turns on. If you hit those pressure at those times your charge is accurate. If you hit it sooner then the 10 to 12 minutes your over charged if you don’t reach that mark your refrigerant is low. Granted you don’t know how much over or under you are. But you will know one or the other
Great video. Excellent attitude to customers and trouble shooting
I do my best for my customers even though I'm an employee at a large hvac company I really am working for the customer who hires my firm
Good troubleshooting vid Hackster ...
Great Trouble shooting !!!. I have LG unit only a few week old randomly shutting off no codes i found high voltage coming in @ 246 volts. Have a call in to the utility see what they can do
You are really putting out some good videos lately. The unfortunate thing is a lot installers do not now what the dip switch setting should be, on other Mitsubishi units a jumper wire needs to be cut for crankcase operation. All Mitsubishi units I sell is the Hyper Heat models, now you would think since these units are design for cold climates that they would automatically do this at the factory, the problem is that would lower the efficiency of the unit, and manufactures do not want to go down that path
@@Daniel-wl7rl Kind of lying to the government.
@@ignacio8597 the government has lied to you all of your life... heavier than air refrigerant harms the ozone (obvious nonsense) ... then obama invented green house gases... I see clearly now... malarkey... new gas will always be the reason for "climate change"... r410a which replaced r22 which replace r12... will soon be ousted as well. You can thank legislators hired by manufacturers (mostly carrier and CHINA) for that..
Wonder why that auto defrost got turned off?
They are usually there for a reason. Kinda like a frost free fridge. If it isn’t defrosting as usual eventually it plugs with ice and quits working.
Wow these are really clever units
Greetings from Michigan, I'm semi-retired with 45 + yrs in the HVAC industry & HVAC Instructor. I'm working as a ductless mini-split Technical Support representative for Thermocore. Systems. Love your down to earth approach on troubleshooting. Great job. I need to know what type of camera are you using for your video presentation. I'm blown away by the excellent resolution. Can you give me the info on the camera that you're using? Thanks.
Hi i am using a go pro hero black 6.
Nice educational videos man!!! I'm a fresh subscriber, and I have a question regarding the communication you have with the customer when you explain to them what the problem might be. I've seen couple of your videos, including this one. Out of curiosity, do you think that most of your customers understand the air conditioning terms when you are explaining it to them? Like for example on this video you brought up the TXV to the customer and it seemed that he knew what you were talking about.
I am not sure if my customers understand air conditioning, I do it to help them understand what I am doing. I might be flooding them with too much info.
Nice video, check if the inside coil is clean or setpoint adjustment, low fan speed and high temp setting can cause this problem
The coil was clean, I didn't check the low fan speed setting yet problem went away after activating the heater
When you go to the roof what tools will you bring with you?
Hello, L8 error code mean over current fault, what can i do for my unit.
I carry a 1” x 8” PVC tube to view LED’s in bright light - think of it like a periscope. Just hold the pvc over the led and look straight at it.
Great idea 💡👍
JR Chicago lol I use 3/4 sealtight
Yes you have to be careful what you say to customers. Ive had them call the company to ensure what i was saying was correct. I try to keep it simple but informing as well showing what i find and why its not working properly. All u can do
Geesh man those Mitsubishi units ain't no effin joke..I see more and more prob with those mini condensers...great efficiency but there badd if not maintained properly
And something that's as complex as these inverter systems prob should be checked every 6 months...just to be sure
Well nice job and catch bill....always great content...
Jesse Lute Yeah I am not a fan of variable speed ac and heat let alone inverter systems, just makes things more likely to fail and more expensive to repair! Kind of how cars have become more costly to repair and more likely to have problems with all the unnecessary electronic crap!
Good job on the explanation of the txv location and the refrigeration cycle to the customer. Alot of people don't realize how much customer interaction goes on in the hvac trade.
Mini splits don't have TXVs
You know your stuff when you put the lid back on top for air flow
Does the compressor have a crank case heater on it? Also I think the compressor has a 2 min delay on start up from heat to cool or other way? I don't know much about these units but why is the pvc chase with a 90 or 45 used on the line sets? I'm trying to learn about these units. Any help would be helpful. Thank you for this video, love to see more on them.
Ray Ray
That’s just to prevent rain from coming down the pvc pipe. These inverter units aren’t easy to work on and to troubleshoot them you need to take classes in most cases.
These can be tough videos cause I am reading Service Manuals on many of these jobs. If you like them I can defiantly make more since I work on these Mitsubishi units for 15+ years yet technology is always advancing. Here is an inside secrete and the link may not work here but mylinkdrive.com is where I get any service manual for any Mitsubishi I am working on. This is the holy grail to most Mitsubishi equipment
Thank you for the link will try it Hacker thanks kid.
Using 3inch pvc to penetrate the roof is actually smart,when installed through the wall,you drill a 21/2 hole,so3 inch penetration is actually larger,plenty of room for Freon lines and control wiring!great video,spot on for the call,definitely slugging!
@@thehvachacker Thank you SO MUCH for this link!!!
@guruMN, my Mitsubishi mini split heat pump is blinking 5 flashes. Is it the possible PC board? Condenser shuts down but after a few minutes it comes back on, only after about 3 hours did the error flash code come on. In a/c mode, unit is fine with the right amount of refrigerant. Any suggestions?
Check the dips switches on the outdoor pcb. If the one that sets the capacity (sw6?) is not set correctly , the unit will turn off prematurely
Between MHI and ME Splits which one is more reliable and durable according to your experience ? Thanks.
ME
Good Job
When a dual head split unit gets locked out from setting one on heat and one on cool. How do you get it out of lockout? Interior Units come on but exterior unit fan doesn't come on. Help please!
Both have to run on the same setting either cool or heat.
Bro I’m running into the same problem 10years after my install on a Mitsubishi
My outside compressor stopped running. Inside blowing like in fan mode on all settings - no lights flashing.
I turned off and back on the outside unit multiple times - checked the breaker box and nothing changed - left the outside compressor switch off - went to work - came home and switched back on. Started the inside unit and guess what - the compressor came on!
I read that leaving the outside compressor switch off for 30 minutes or so resets it. And now it seems to be working.
Going to run it through the night. Its a Mr Slim Mitsubishi split air - 36000 Btu unit.
I have the repair guys coming in 2 days to Replace the entire compressor - its will cost 6 grand and change to replace.
Damn! We’ll see if it runs tonight and tomorrow!
Sometimes resetting the unit gets it working again. Anyway how did it go with your system?
How u mount these and make them wind proof near ocean environment to flat epdm roof
They sell a mounting bracket. Is this unit on a roof? You can screw unit to pad and use an adhesive to fasten pad to flooring. Fasten unit to larger condenser pad
@@thehvachacker I am buying a 4 ton mtisubishi unit I have an epdm roof near ocean with high winds
Bout to tell hvac guy to install two 2 ton units so they don't get something too tall
@@thehvachacker thank you
@@ComicKish make sure you get the wind kit that shields condenser fan from wind
The bug is in the board !!! Replace it ...
It's a stink bug 😁😅😂👍
How bad is an overcurrent? Doesn't the unit just throttle back to protect from the over current?
It shuts down the unit because the overcurrent is almost like lock rotor amps. The cold thicker oil slugs the compressor. The compressor shuts down instead of blowing up the inverter board
Do you know what can cause a air con room air conditioner to leak water out of the vent inside? Id hooked a shop vac up to drain line it seems to be draining fine cant see a drain pan don’t believe there is one but it only does it if im using ac the unit has a dehumidifier mode that cools aswell and it wont leak a drop
Beau Whiteley it could be sweating on that mode
How cold do you set the ac system. I seen systems set at 64 and water was condensing on the outside of the system
Hacker I love the video I want you to take a look at the Knipex StriX let me know what you think. Peace brother
II have a nws wire strippers that is very similar to the strix minus the cutting blade. Does the knipex stay closed? The nws doesn't. The nws was a gift from father in law from Poland along with the lineman/ combination pliers I use all the time and cable shears. I did a video on my other channel. I really like those strippers if I have a lot f wiring. It's easier to strip wire pulling than doing a sideways motion.
@@thehvachacker hacker I'll have to look into the Knipex striX to see if they stay closed or not I'll let you know when I find out the information. Peace brother
Isn’t preheat on already from factory? So someone turned it off? Who the hell would do that?
Is it factory set? I don’t install just service them
@@thehvachacker Ask Ralph Wolf he factory Mitsubishi service guy. Go to T & N services is his old company..
According to the manual it comes set on already. (I checked after the vid, I cheated 😁).
It does not. I just took the class from mitsubishi. Then came home to my unit and sure enough it is not on.
i assume thats inverter ac
Yes it is inverter board for the compressor
@@thehvachacker over engineered junk
I've never been a fan of variable speed hvac systems unless the variable speed is on a ceiling fan! Every home I have lived in had single speed and stage ac and gas furnaces, never felt temp swings with those systems! I think it is just a ploy to raise the cost of a product and push this environmental jargon! And those systems were cheaper and easier to repair!
These system do use very little energy and are really quite in operation. I like the Mitsubishi product. Unlike LG if you lose the compressor your inverter board also fried. The Mitsubishi usually doesn’t lose both components.
It's all about high seer energy efficiency
Actually, if mini splits are properly installed, protected from voltage surges, and properly maintained (you know, get cleaned once in a while) they last just as long as a conventional split system and cost a fraction to operate. The overwhelming majority of mini split calls I get are dirty evaporators/condensers/blower wheels, dead remote batteries, and low charge. Toss in a few dead inverter boards here and there because it was installed by the cheapest bidder who doesn't know what a surge protector is and you have the overwhelming majority of mini split service calls. I've never seen a dead compressor and I know few who have. I've seen one bad EEV. I've seen one bad IR receiver on a head.
They make sure you go back to the manufacturers distributor network to buy their junk made in China or Mexico high priced parts that only work on their units that only talk to their own matched systems. Then keep all the troubleshooting information top-secret. There are a bunch of con artist and greedy bass towards anymore.
I like your videos. I know the its tough to video while working but I wish the camera were showing what you're doing. Most of the time the camera isnt pointing at what youre doing.
It's interesting, I was noticing power usage on my mini split when it was off, about 35W and LG did a great job of not disclosing that information in any of the provided manuals. LG rep said it was done by passing current through compressor windings and would be active all the time. Yet I see it go off completely and sometimes draw like 15W, seems to be temperature regulated. Cheeky bastards praising their unit efficiency and hiding those important facts!
FrozenHaxor Inverter technology is hype, it really isn't better, just makes a repair more expensive and a unit more likely to break down! Mini Splits are good for buildings that have hydronic heating and no duct work as an ac retrofit, and very small apartment suits and cabins, but for whole homes I would just use a gas furnace and central ac setup!
@@albertastorms I agree with you. However most homes and buildings in the NYC/NJ area dont have ducts. Thats why mini splits are very popular here
That is true! I tell my customers to shut the breaker off to their mini split units in the winter if they dont use it as primary heat. If you listen carefully, on a cold winter day, particularly on LG units, you can sometimes hear a small whining noise
@@xcmskim4 My LG minisplit does that as well, comes on when the temp gets below like 4*c.. always wondered what the deal with that was, kinda sounds like a mouse deterrent
Every manufacturer that cares about compressor longevity has a crankcase heater of some sort. Do you prefer foaming oil and washed out bearings every startup or properly lubricated bearings and long compressor life?
You misspelled Mitsubishi
Thanks I corrected it
Nice trouble shooting video man
I apologize it’s me having to look into service manual more than actual repair work yet with these ductless systems and VRF are so complex without service manual I might not of activated the crankcase heater allowing the compressor to start in cold temps
No worries if I am working on something sometimes I have to take a look at the service manual
Nothing worse than selling a part only to find the fault appears again in the future, Makes for a unhappy customer..
I eliminated the problem by turning on the pre hat/ crankcase heater. What compressor can pump sludges up refrigerant. I looked into this customer file room and this call and an inquiry on a heat pump stand was made 3 weeks later.
Good ol’ Mitsubishit mini-shit
Haha too right
Komentar 9
Katastrophe
wtf my my ac is in this video?????
heat pumps gotta love em!
cops comming you stealing there unit lol