Mitsubishi Mini Split Throwing Codes!!! How to Diagnose a Mini Split. EP66

Mitsubishi Mini Split not cooling in the kitchen. The system was showing a abnormal voltage error. Here's how to diagnose the issues with this mini split. Ended up being a short in the main power board. Check it out!
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[@jamespatrick9449]

Far from a horrible Tech. I really like your videos, I always learn something new. To the point and informative. Thanks for taking the time to make them.

[@tyl8ter]

Nighthawk...keep them comin...great vidz

[@josephmoxley5792]

Mini Splits on Commercial Roof tops usually have this issue. They aren't meant to be on top of the roof. Lighting strikes Electrical Surges doesn't take much to get the CPU fried. Need some type of Surge protection to slow the electrical issues. Put an AMP Fuse so It pops the fuse and the board.

[@hvacmania8323]

Shade

[@KuntalGhosh]

That is not a cpu. That is called ipm. Basically the huge chip that is screwed onto the heatsink. Contains a full bridge 3 phase igbt set and control circuitry with protections and other sensors. This is the part that makes the 3 phase ac at variable frequency to control compressor speed and cooling power. I have 5 panasonic inverter mini splits and they are working fine since 2017 , not a single issue on one of them. They run 12 hours a day in Indian summer heat. Today it was 44c and it has been above 40 for this whole month touching 45 sometimes. None of these inverters have issues with the heat. You just keep them in shade and oversize the units. I have 1200sq ft floor space and installed capacity of 7tons. It uses 2 3 tons of capacity when the set temperature is reached. This puts lot less strain on the inverter. And i will never go back to those non inverters.

[@hkhsm359]

Nice video. Thanks for sharing

[@UltraElite-ju8bb]

Tech support free resource

[@djsm0609ify]

Great video, babe!

[@calvinnewcastle5899]

Nice work brother

[@frankcastillo9199]

Great tips 👌

[@winkhvac62]

Good video

[@hvacmania8323]

Outstanding 🎉 videos thanks for posting. You think maybe some shade would prevent this issue?

[@gpowerdragon9852]

if the electronics break often it's usually indication of high voltage Spike like thunderstrike that has been close by before you need surge protector plug on it

[@christianneal8204]

You might want to put a Koolguard 2 on that system. It's a voltage monitoring surge protector.

[@SuperSincere1]

But why does the boards keep blowing?????

[@Patriot20233]

Thanks

[@chrislester3152]

So that might help in the future to make sure that none of these inverter mini splits are put on twin breaker because it will cause a compressor over current protection code and probably burn one up if not fixed after a while

[@Yukonjackman1]

Mine was a poor connection in the electric part had no heat on its setting.

[@TandNServices]

As soon as I saw the back of the board @ 5:11 I knew it was because of the thermal paste not being installed properly. I warn guys all the time about the importance of it.

[@NighthawkHVAC]

100%. Agreed. Love your channel by the way!

[@gowkarranpooran4771]

Thanks for sharing

[@zabalaan]

Solid red and yellow and 11 blinks on green. What does that mean? The manuals dont even mention green led on the outside unit

[@mikemoore466]

They make surge protectors for these units. I would definitely install one on this unit.

[@NighthawkHVAC]

I agree. The client doesn’t what to pay for it though.

[@mikemoore466]

@@NighthawkHVAC well they can keep installing boards then. 👍

[@zigavucic754]

I think you will be back for same problem,this is a compressor winding problem.

[@westsidehvac1097]

compressor is bad is gonna keep popping pct board

[@KuntalGhosh]

Always keep air conditioners in under shed. Make tiny sheeds around them . Putting them under direct sunlight not only increase your electricity bill it also puts lot more strain on the inverter parts. These do not like to run hotter than 70c internally. You don't need too much paste . The thing that you need to do is to properly clean both the heatsink and the ipm chip with tissue and isopropyl to remove any oil residue and old crusty paste. Then install fresh thermal paste and spread it with the supplied spoon that comes with lots of pc thermal paste. And you can use pc thermal paste those are lot better than these thermal grease. They aren't much more expensive and you can get the 30gram tubes of noctua h1 or h2 and that would last you 60 installations.

[@KevinfinityDrums]

What? You should never restrict or stifle air flow around a unit.

[@jhoney2346]

I’m dealing with this exact problem currently. Any more issues from this unit after this video?

[@NighthawkHVAC]

It’s still going.

[@chrislester3152]

I have cured protect compressor codes by changing them off Tandom breakers , they don’t like being on them ,

[@haochen6247]

The suction pressure looks too high isn't? Is the system over charge which is causing the high compressor over current protection?

[@NighthawkHVAC]

This system has a variable compressor and charge can’t be determined by pressures as they may look high or low. The only way to check the charge is to weigh the charge. This units charge was to factory specifications.

[@haochen6247]

@@NighthawkHVAC I agree that inverter unit is best to weight in refrigerant. However, as alternative, you can also have all the indoor unit run at the max cooling mode, and charge it based on the gauge reading to around 125. There got to be reason for repeated blown circuit board. The mini split come with pre-charged refrigerant up to certain length and also have requirement for minimum total pipe length. For what I have seem with many Fujitsu and other brand that I have fixed, in cooling mode, when compressor is running, it never get this high suction pressure. while when the compressor is not running, it could get above 200 psi. I would suggest if all choice is out, check if the system is overcharged.

[@Ricky32908]

That board should have insulation on whatever is on top of it. If it doesn’t and it’s bare metal it will short every time

[@briandonovan7099]

Sorry to sound like a newbie but how do you use that reset lever on the back 😂

[@julieanehurley-hv4bv]

Good question...the exact box on the mini split I have has the fuses.

[@theduffster2581]

What about installing a phase monitor?

[@NighthawkHVAC]

My thoughts exactly. Client didn’t want to pay for it though.

[@theduffster2581]

@@NighthawkHVAC I figured as much bud 👍🏻 benn through it many times but the callbacks become costly sometimes

[@NighthawkHVAC]

I told him if it happens again it’s on him.

[@garry9586]

Where is the surge protector at?

[@NighthawkHVAC]

Lol. Good luck getting a client to pay for that!

[@pcar5]

You will be beck. Something is causing the failures. Always told my techs...troubleshoot the cause not the symptom.

[@NighthawkHVAC]

Been over a year and still works. I think the previous tech didn’t tighten the screws tight enough to make good contact to the heat sink causing it to overheat.

[@jhonnybenito7464]

Maybe someone seated on top of it and create the short

[@roundedges2]

Ok but what causes 2 boards to burn?

[@NighthawkHVAC]

First one was a surge. 2nd one the previous tech did not use thermal paste and did not secure the board to the heat sink properly.

[@ezhilbenit630]

comprser heter

[@PabloRodriguez-ck7ph]

Pues qué fácil es repararlo cambiando toda la tarjeta, sería mucho mejor tratar de reparar la tarjeta Eso sería algo mejor.

[@trinito97]

Put a new one

[@sparkyobrian6417]

i have 4 large Mitsubishi units (5 years old) and they have been nothing but trouble , labor is very high , and the companies in my area have a hard time fixing them. ill never buy Mitsubishi high dollar junk again