Lennox Prodigy Playing Games RTU Not Cooling

Рет қаралды 10,688

2 ай бұрын

This Lennox packaged rooftop unit had a Prodigy 2.0 Unit Controller board that was acting up causing the compressors to short cycle resulting in the main breaker tripping. I have not done a lot of work with the prodigy system so common sense led me to what I found, and I confirmed it with Lennox to verify that was the problem before ordering such an expensive part.
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Пікірлер: 111

@Boodieman72 Ай бұрын

Had a local tech come out to do an AC check on my home. Somehow they managed to short or do something that killed both the circuit board and the wall thermostat. Nice to see a real professional at work.

@HVACRSurvival Ай бұрын

That really sucks, sorry to hear that! Thanks for checking out the video!

@TheGhettoLobster Ай бұрын

They hooked up the high voltage to the low voltage on the contactor

@timbrown9305 8 күн бұрын

Great to see "REAL" diagnosis. Fantastic !

@HVACRSurvival 8 күн бұрын

Thanks 🙏 👍👍

@matthewrichardson2467 Ай бұрын

Hey Rick, Love your methodical troubleshooting approach, and your take the previous guys assessment with a pinch of salt and you confirm things for yourself.

@gordonborsboom7460 Ай бұрын

Satturation temps are the ssame yes...just dont forget to reset the refridgerant type on your electronic gauges. This has caused me all kinds of unnecessary grief

@HVACRSurvival Ай бұрын

I know me too🤣🫶 it happens all the time

@jasonyeager9102 Ай бұрын

Same…was working on a walk in freezer (404) on one call and then went to a 410A AC call and was like damn this is low…good thing I noticed before going further.

@ryanisaacson118 Ай бұрын

Yep

@jasonjohnsonHVAC Ай бұрын

Nicely done Rick. Condemning a board is the absolute last thing on my list, whether i originally suspected it or not. You were very detailed and methodical in your approach

@HVACRSurvival Ай бұрын

Cool, thanks! I knew that control board was going to be pretty expensive so I want to be darn sure.

@jasonjohnsonHVAC Ай бұрын

@HVACRSurvival and you did make sure. Too many people condemn a board without going through the proper steps.

@jaymartin5095 Ай бұрын

I had been wondering where you were. Thanks for the update. This one was interesting, eliminating everything else one by one. Then have the vendor confirm it's their board. Nice sleuthing and keeping your cool. Thanks for the education.

@HVACRSurvival Ай бұрын

Thanks Jay! Yep just stupid busy

@johnstrh1 Ай бұрын

any other newer guys like me watching, what he said about looking at the temps not the pressures is what really helped me a while ago. when you see 5 or 6 different refrigerants in a day going by temp is so much easier

@HVACRSurvival Ай бұрын

Preach it 🙌

@Brooks.Mechanical.Electric Ай бұрын

It makes so much more sense than trying to memorize pressure for everything you work on. I learned that way and rarely even put much though in the pressures.

@HVACRSurvival Ай бұрын

@Brooks.Mechanical.Electric It just clicked for me early on. It’s amazing how much you hear about pressure when listening to others.

@Brooks.Mechanical.Electric Ай бұрын

@@HVACRSurvival went back this evening and looked up some of your old videos on geo units and found where you showed your gauge setup. Where would I find the needle end to adapt to the test port?

@HVACRSurvival Ай бұрын

@Brooks.Mechanical.Electric you can find it online if you search for geothermal suppliers I was able to get mine at my carrier supply house. Habegger Corporation is who we use.

@throttlebottle5906 Ай бұрын

"how dare you" not release videos daily. LOL. I was ready to send search and rescue looking for the roof, rack or cooler you was stuck in. 🤣🤣🙃

@HVACRSurvival Ай бұрын

🤝😅👍👍

@stevencossaboon3237 Ай бұрын

Nice troubleshooting and job Rick.

@Josh.SPublishingTeam2024I Ай бұрын

Good video rick from watching your videos i learn alot about these units! 🎉🎉

@HVACRSurvival Ай бұрын

Thanks Josh!

@zekenzy6486 Ай бұрын

Great video. Thank you for sharing. Have a nice weekend. I'm so happy to see you back. I see you in next video 💯

@HVACRSurvival Ай бұрын

Thank you, I’m gonna try for another tomorrow but it depends on time

@Boraxo Ай бұрын

That Jumper King is slick. 👍

@jimfurnell7657 Ай бұрын

Awesome diagnosis' your trouble shooting skills really make me stop and rethink of my approach to low voltage issues. Sometimes they can drive a us techs crazy. Great informative videos, stay safe.

@HVACRSurvival Ай бұрын

Thanks Jim!

@joeyf504327 Ай бұрын

it's probably a failed capacitor on the controller that is there to supply current during DC power draws for the computer when activating the 24VAC control relays. I have seen this happen in printers. They get stuck constantly rebooting because a capacitor fails and can't provide current during startup when there is a momentary power draw. New cap and good to go.

@HVACRSurvival Ай бұрын

Lennox guy said there’s a relay that fails?

@wd8557 Ай бұрын

Nice, I'll have to put this one down in my book.

@andyread4332 Ай бұрын

Love your work Rick. Keep em coming

@HVACRSurvival Ай бұрын

Than you!

@helmsajr Ай бұрын

Great job Rick Lennox not my favorite unit to work on but you got it figure out.

@HVACRSurvival Ай бұрын

Thanks 👍

@maintenanceman1015 Ай бұрын

Worked on AAON units where the control board controlled a bank of relays . If a contractor went bad it couldn`t take out the main board. But had the blower short cycle ,the relay would turn on the Frequency Drive then shut off . Was the coldest day in winter ,why not think was -10 ,just pulled the relay out and reinstalled it . Good to go , Got 3 back relays just in case , 13 AAON units at that location.

@Dalan612 Ай бұрын

Solid troubleshooting Rick. Thanks for the upload 🤘🏼

@HVACRSurvival Ай бұрын

No problem 👍

@thesilentonevictor Ай бұрын

Good troubleshooting Rick

@elBusDriverKC Ай бұрын

On those prodigy units, they have a self test mode. Pulling the wires from the thermostat connections and putting it into self test can help get thermostat problems / thermostat wiring problems out of the picture. I've seen a few go bad here and there. At $750 - $1000 it's an expensive failure. Fun part is having to reprogram the new controller for all the fancy settings.

@LilyRoseElectric Ай бұрын

Great job 👏 Killing it.... always the best

@user-bj3wj9oj6h Ай бұрын

Thanks for your videos.

@HVACRSurvival Ай бұрын

Glad you like them!

@kenebler7855 Ай бұрын

Awesome video thanks for going through everything like you did very helpful

@HVACRSurvival Ай бұрын

No problem 👍

@Gcanno Ай бұрын

Thank you .

@HVACRSurvival Ай бұрын

You bet! 👍

@MariosACandRefrigeration Ай бұрын

It could have been a sensor or some other thing,unplug everything and reconnect until it shows a problem to isolate,also you can switch 24 volt on transformers in case that one is weak.thanks for sharing.

@kingwookie7210 Ай бұрын

lennox one of my least favorite over engineered RTU's, good work as always.

@HVACRSurvival Ай бұрын

Same here!

@jamesashley3827 Ай бұрын

Thanks

@HVACRSurvival Ай бұрын

Your welcome!

@davidpetetsen3744 Ай бұрын

Nice video I had same issues with lennox 25 ton rtu just like that

@HVACRSurvival Ай бұрын

Good to know I’m not alone

@Brooks.Mechanical.Electric Ай бұрын

Hey Rick, another great video as always. I've been spending every spare minute i can, which isn't much time these days cramming in all the knowledge I can on the newer equipment we're see on a more day to day basis and one thing I'm having to study up on is geo water sourced units, and ive been doing a ton of inverter type heat pump systems. I know you have a few videos I've watched on the geo / water source systems and was wondering if you have any recommendations for a good pressure gauge for checking out the water loop? Not a ton of info online that ive seen and I thought of you as a good person to ask. Take care my friend and thanks for any suggestions you have!

@HVACRSurvival Ай бұрын

I use an old refrigeration gauge. R22 type, I drilled the restrictor plate at the bottom. It works great

@Brooks.Mechanical.Electric Ай бұрын

@@HVACRSurvival awesome, thanks for the info.

@DanielGaytan-vl9hw Ай бұрын

The board has a limit on the incoming voltage, any voltage higher that 27v Ac will cause it to lock out or act like that. You need to change the primary voltage tap on the T1 and T18 transformer to lower the secondary voltage.

@HVACRSurvival Ай бұрын

You would think Lennox tech services would have said something about that. He did tell me that there’s a relay inside the control that has a history of failing. 🤷‍♂️

@terrygrant8126 Ай бұрын

You did good friend!....

@HVACRSurvival Ай бұрын

Thank you!

@waynetirrell2358 Ай бұрын

Great Video! I always looking forward to each one 👍

@HVACRSurvival Ай бұрын

Glad you like them! Thanks!

@knockitofff Ай бұрын

0:34 that's a sheave LOL

@HVACRSurvival Ай бұрын

Whatever🤫 you knew what I meant. 😆

@danpresson Ай бұрын

Awesome video

@HVACRSurvival Ай бұрын

Glad you enjoyed it !

@Pippy626 Ай бұрын

I love the videos. If you ever need help with editing I can assist. I wouldn’t mind a few longer videos too

@rjeepster8640 Ай бұрын

I would start by putting a thermostat right to the controller to find out if downstairs is causing your issue

@Eddy63 Ай бұрын

Nice troubleshooting as usual ... Are you & Chronic gonna do any more streaming ... They were always fun ... Thx

@HVACRSurvival Ай бұрын

Eventually. Crazy busy lately

@subcoolHVAC Ай бұрын

Nice Troubleshooting , thankfully compressors were still good 👍

@HVACRSurvival Ай бұрын

You got that right!

@MegaDesna Ай бұрын

ALARM 82: Means don't worrey "boutit xD XDD

@HVACRSurvival Ай бұрын

😅

@xenories Ай бұрын

It looks like something low voltage is shorted and when it wants to turn on it shorts main transformer, the proper diagnostic whould be to unplug everything from the board and connect slowly thing back until it trips. Or just chech resistance on everything low voltage. I dont think its the main board.

@HVACRSurvival Ай бұрын

Well, like I said, I talked to Lennox tech-support and they said it was the board. Because what I unplugged was all the outputs. Also, if it was a short, the amperage would’ve went up on the transformer. I eliminated that even as a possibility by putting the amp meter on there.

@ceilingfanmusic6597 Ай бұрын

So i have 2 hypophises as to whata going on with that controll bored. 1: the filter caps on the voltage ragulation circut is going out causing the MCU to be unstable to the point that any change on the power rales causes the MCU to reset. 2 one of the relays on the controller has a shorted coil ( the y1 relay) and when the controller trys energyzing the relay it pulls down the supply dc voltage for the controll bored and causes it to restart. Pardon my bad spelling

@HVACRSurvival Ай бұрын

Lennox tech service told me that there’s a relay inside there that has gone bad so you might be correct

@AErefrigeration Ай бұрын

Give us a 3 hour video

@BlackAck90 Ай бұрын

Still trying to find out where "AcrossT" comes from.

@MariosACandRefrigeration Ай бұрын

1 pound of extra refrigerant will make those microchanel trip.

@halverde6373 Ай бұрын

Everyday nightmares every service tech is forced to contend with. How much would you be willing to pay anyone to handle that?😰💰🤣

@brianjones5935 Ай бұрын

ya let me just rip into the insulation lol

@HermesVintage Ай бұрын

Any updates on this service call? If the board solved the issue

@HVACRSurvival Ай бұрын

It just happen Thursday. The store has a HVAC crew that put on a different series controller and it attest has one stage of cooling until the correct board comes in.

@MariosACandRefrigeration Ай бұрын

hello Rick.

@HVACRSurvival Ай бұрын

What’s up!✌️

@EverythingHVACR Ай бұрын

Saturation, Saturation, Saturation. Nicely done, Rick

@HVACRSurvival Ай бұрын

Thanks Steve 👍👍

@CM-ou4zr Ай бұрын

Wow that's a bad diagnosis from the guy before you. Shorted compressor? What are they smoking in ohio rick

@HVACRSurvival Ай бұрын

They diagnosed that on another unit not that one. I just misread it but the way they wrote the description kind of sucked, but since they’ll probably watch the video, I have to be careful what I say.🤣

@MrJujubean Ай бұрын

Great trouble shooting video. You outta here controller lol

@steveblake8766 Ай бұрын

253 thumbs up

@himrfreeze Ай бұрын

In the service mode u can test. Run each compressor and if you jump have to do y g and r and if summer u can leave compressor on in service mode sometime even with faulty board

@HVACRSurvival Ай бұрын

I need more time with that board. I haven’t had a chance to work with it much.

@johnwalker890 Ай бұрын

Good job Rick, Ghost controller issues is what I call it, I wasn't sure what happened to you?? I thought you were in You Tube jail?? Just kidding, God forbid......

@HVACRSurvival Ай бұрын

Nope. I mentioned it at the end. Stupid busy and I’m on call

@johnwalker890 Ай бұрын

Well they got the right guy for it....

@thefathvacguy6341 Ай бұрын

Trane or Lennox....which do I hate more....hmmmm

@HVACRSurvival Ай бұрын

🤔🤔🤔🤔 the correct answer is…. Both.😅

@thefathvacguy6341 Ай бұрын

@@HVACRSurvival Very true!!! 🤣🤣🤣

@tysonrojas5477 Ай бұрын

Could of megged out compressors and saved time

@HVACRSurvival Ай бұрын

Yeah, but unless you have a log of what you’ve had in the past, it’s a well-known fact that you can’t just go up there and make a definite guaranteed diagnosis unless it’s really bad short and you can see the super low resistance and the test voltage actually drops. You can have moisture in the system or liquid lane in the compressor and that will give you a low mega meter reading.

@halverde6373 Ай бұрын

The actual problem is it's a Lennox. Similar to Trane. God help all of us that fight against chaos. Glad I made it out alive to retirement. Fond memories but I don't miss it.