HVAC Service Call: LG MULTI V IV Not Cooling/Heating (LG Multi V 5 Error Code CH26/Error Code 261)

[@HVAC544]

Cool to see more VRF content. We've had a bunch of issues with the gen v units losing compressors. I'd assume most of it was install/commission issues more than anything. We cut one open and the scroll was shattered.

[@JumpermanTech]

Glad you're enjoying the content. A 3rd unit went down today but it was an outdoor fan motor related issue. This place is going to be fun

[@JumpermanTech]

This location has had & still has a bad experience with losing compressors. Any input or advice? Thanks for watching!

[@HVAC544]

@@JumpermanTech Never messed with the Gen4 units only experience with the 5's. We have had LG tech support out from Korea. Still waiting for the report back from them. Ducted airhandler airflow was never setup properly at this job. However, I feel that's not going to solve all the issues. We put surge/phase imbalance on the units and still loosing them. We never get any codes from unit prior to the CH21 once it shows a CH21 its mechanically failed. Biggest thing to cross off the list first is proper installation and piping along with proper nitro brazing. Obviously it can be hard to view some of the piping once its already installed. Other than that just recording the units and going over the data if you see crazy EEV readings or temps that don't make sense investigate. These units are becoming more common in my area seems like yours the last 20. Finding guys that are knowledgeable on this stuff is hard and the manuals only show you so much.

[@HVAC544]

@@JumpermanTech We have done 9 compressors and 2 four way valves at one site. We have a system down now but its still at minimum 1.5 days we usually get 2 full days incase of hiccups.

[@rodgraff1782]

@@JumpermanTech I would check the level of oil in the compressors coming out. I would also check the clarity of the oil, odor, and test for any acid. Flooded starts are the number one killer of compressors. Sounds like you have had multiple compressor failures on some of the units. I would check for proper installation or design problems, or possibly power problems at the site. I wish you luck. Are the compressors out of warranty now? Do you think the inverters are killing the compressors, or do the inverters fail due to grounded compressors? I don’t know much about these systems, but do know a lot about the cause of compressor failures. Those roasted compressor jackets look like their getting hot. Is this a common problem with other buildings? I use AEMC hand crank meggohmeters. I’ve got three. You can’t find them reasonable on eBay. They are industrial quality. Been using them for 25 years. They are analog, and don’t use a battery. Test voltages can be set for 250, 500, or 1000 volts. Also has a built in voltage tester. I don’t like ohmmeters that use 9 volt batteries. I usually test with twice the motor voltage. It will also read high, if there is any moisture or contamination in the system.

[@arielhernandez2911]

Damn bro putting in that work mad late there and dark you work alll over nyc

[@JumpermanTech]

Definitely putting in that work right now. Let's get it 🔧⚡️ Thanks for watching!

[@samuelsteffan6987]

I work with VRV mainly. We have issues with compressors just like any VRF. Most of these issues stem from bleed by on indoor eev's. We've seen proper maintenance through the year greatly reduce bleeding by. With older models such as the lll's, we saw that autocharging prematurely set charges wrong. By doing routine maintenance on outdoor main eev's, you can see that they crack over time. Changing these out are very beneficial to said compressors. We've also had bad luck in past years with aluminum(rough lock) installs. With aluminum, leaks are almost always a certainty. Keep up the good work brother, love the channel.

[@HVAC544]

Is that just indoor unit eev's or even the ones in the heat recovery boxes? One of our compressors the scroll shattered almost like it slugged liquid. Was told the unit should catch it before that happens however in theory is not always the results in field.

[@samuelsteffan6987]

@asdasda z we've had eevs in the bs boxes flood. But, I believe that's more of a rarity. It does happen, but is rare. We've seen more and more indoor cassette eevs and outdoor eevs bleed.

[@samuelsteffan6987]

@asdasda z also, was the compressor on a VRV 3 or 4?

[@HVAC544]

@@samuelsteffan6987 Gen 5 LG unit. I know certain vrf brands and models all have their quirks. The safeties should catch flood back in cooling we have one unit throwing those codes right now.

[@samuelsteffan6987]

@@HVAC544 they all certainly have reasons for bleed by no doubt about that.

[@josephderusso4594]

We have a bunch of those lg garbage in nj ; compressors n board’s going bad also!! We had to keep compressors n boards in stock at sight; tech support sucks! Love ur videos brother keep them coming!!!!

[@Hamasisfilthytrash]

Called a bad install!!!

[@johnwalker890]

Good job Jumper, That roof is scary, and the steps, be careful.

[@JumpermanTech]

Thank you John! I enjoy the view but not those steps. Those steps are kinda scary & a pain to go up/down all day. Stay tuned for new videos every week!

[@mrbugenhagen3364]

Oh no 😰 2 out of 16. Better keep those plastic crates and an umbrella on standby.

[@lewissaunders2837]

Standard bullshit kit we deal with in the UK unfortunately. Complete junk

[@briancarlisi2224]

I think this is the 3rd failed LG unit on this roof…

[@HVAC544]

@@lewissaunders2837 That's good to hear these units have been giving us fits in the states.

[@JumpermanTech]

Haha that's a good one. Thanks for watching the first one! You'll like tomorrow's new videos then 😂 I might need more umbrellas soon

[@JumpermanTech]

​@@lewissaunders2837🤦‍♂️🤦‍♂️🤦‍♂️

[@nicolerennie]

🤯😱 great video, these units are something else

[@commenter5469]

Liquid refrigerant migration can cause compressor to short out. Maybe even temporarily. That’s why compressors insulation resistance requirement are usually lower than other motors. It is usually important for the freezers and coolers - but you are still in a cold weather, you should check crank case heater, whether it’s even installed, and whether it’s still good. And if it’s bad - why board didn’t produce the fault code and didn’t shut down the machine. And if the compressor didn’t have heater installed from the beginning - someone who ordered this equipment did screwed up.

[@jrh86]

Excellent tutorial on these LG units, the best.💯👍👍👍

[@drewc7479]

Hey man, watched your other vid too and I recently just picked up a LG vrf cleanroom at one of our sites . Just wondering where you got the info on for other checks on it like the other boards and how to check them? Lots of vrf lines and getting contracts on all them I wanna be able to actually check things before replacing a compressor and board. Thanks man

[@kennethlobo4420]

God Bless love ur videos

[@JumpermanTech]

Glad you love the videos! Stay tuned for new videos every week🔧⚡️

[@sergioramirez9025]

We're can I find that information. Like the pictures you showed to guide me on troubleshooting

[@musakavalci9470]

Those LG's are going keep you busy $$$ Did technical support send you those troubleshooting docs ? Great video 👍🏼

[@JumpermanTech]

They will definitely keep me busy it seems. Another one went down today. That's 3 in 3 weeks😬 They did send me that. They have the better and most accurate troubleshooting docs. Thank you! Stay tuned for new videos every week 🔧⚡️

[@JumpermanTech]

Not a compressor related issue though 😅

[@thesilentonevictor]

Good content jmt

[@JumpermanTech]

Thank you Victor! 🙏🔧⚡️

[@JumpermanTech]

Another day in paradise

[@SGAFOOD]

I saw a picture of the inverter board checking guide in the video. Where can I get this guide and is there a specific training course that teaches all this stuff?

[@kleinerc.s7667]

11:44 could it be that you need to change the thermal paste?

[@electroshed]

The converter board is nothing more than a glorified bridge rectifier 3ph to DC board with a bank of capacitors to smooth the DC right out, also those two black square things I imagine are contactors - when you first apply power these should remain open while the capacitors are charged, slowly by some resistors, then after a few seconds, the contactors close to put the rectifier directly on line - without this, the inrush current to charge the capacitors would pop the breaker. If the breaker pops immediately on power up - check for welded /failed contactors on this board. Also the brown deposits on the boards look like flux from having things like the IGBT module replaced, I think you said these are refurbished but approved boards?

[@stevenpollock6342]

Great view and video but have u thought about moving to florida ac units a lot easier to work on

[@joeshearer1247]

You don’t have to take the wiring off the board when you were doing those checks?

[@zekenzy6486]

Great Video. What is mean invert board , convert board ? Thank you for sharing

[@STONEDay]

Inverters convert DC to AC. Inverting the polarity to form a sinusoidal AC waveform.

[@xanmancan]

Bra just on the roof 😂😂😂😂

[@JumpermanTech]

Enjoying that view 👌⚡️

[@andrewmartinez5287]

A trane vrf had us going in circles recently. First it was the inverter board then another board and then a leak. Not sure what happened but without a laptop, tech support, and proper training I decided to stay out of it and let my lead handle it

[@mflettre6711]

How many hours does it take to check all of the boards?

[@clentcliffordespera3892]

Hey jumper man tech i have question for you how many indoors unit in Multi V5 both slave and master

[@abdullah_q8171]

Why always in vrf the compressor damage ?

[@JumpermanTech]

I have no idea. This is the second one in 2 weeks!

[@JumpermanTech]

Thanks for watching!

[@Hamasisfilthytrash]

Due to bad installs

[@2facefigures]

What app are you using??

[@paramboytv7378]

where we can find the file of the image you are showing to us??

[@lewissaunders2837]

My M500 has never been wrong

[@JumpermanTech]

I always liked that tool. So easy to use. I did just pick up a megohmmeter with an LCD display that gives you an actual number. Solid & for a good price. The Klein tools ET600. Someone in the comments recommended it

[@JumpermanTech]

Thanks for watching!

[@shine-cg9uf]

👍🇺🇸💪❄️

[@JumpermanTech]

🙏🙏🙏🔧⚡️🇺🇲

[@coldfinger459sub0]

You are so lucky you get all the interesting jobs with burnt out compressors on LG units. In the last decade, I have never had an LG unit compressor failure. I must be doing something wrong.. You should never use the Subco magger resistor Ohm tester on these inverter compressor’s . They will test out BAD often when they are not..

[@JuanTodoli]

Another 😲

[@JumpermanTech]

Yup. 2 in 2 weeks. I just started working here 4 weeks ago! Looks like things are going to get fun

[@JumpermanTech]

Another unit went down today but for another reason 😬

[@JumpermanTech]

3 for 3

[@JuanTodoli]

@@JumpermanTech We have here an UNUSUAL rate of inverter PCBs overcurrent issues, control PCBs burnt & shorted compressors.

[@JumpermanTech]

@JuanTodoli I've only dealt with these machines a handful of times here and it's the exact same issues you are experiencing. This happens alot according to the people that work there. These units have been a problem since the beginning. Wow. Any advice?

[@vahyae]

Gasoline

[@JumpermanTech]

Is overpriced, yes. Thanks for watching!

[@sharifakber5197]

I m chillers repairing troubleshooting technicaion . I need a job vacancy at any place you have, please share me.