Fake hot warning, can't figure out what is it

@repairedit, I have to respectfully disagree that the panic logs aren't needed; indeed, there are many problems being submitted to this site that could only be solved using the panic logs; I've personally fixed my grandson's iPhone X when the panic log correctly pointed me to the lightning port assembly being bad.

@joaodiogo, Please take a screenshot or download of any panic logs you have present on your phone; the first page of each is usually sufficient, but full logs won't hurt. Add them to your question and we'll help you track down the issue. That three minute reboot cycle is a key piece of information, as that's exactly how often the iPhone scans its sensors, so at the very least we should be able to get your reboot problem fixed, and hopefully the false overheat issue as well.

Adding images to an existing question - iFixit Repair Guide

Here's a page showing how to use a couple of different tools to read phone status and panic logs; I'm not familiar with the first one listed but have used 3uTools.

How to fix an iPhone that keeps restarting - Panic Log and iDeviceLogAnalyzer

Hi João,

Taking a look at the missing sensors, you're right that there's at least one of them that's a direct result of the power button being disconnected; the mic2 sensor is on the power flex, so that one's to be expected.

However, there are a couple others that shouldn't be there under those circumstances. The Prs0 sensor is on the charge flex and shouldn't be affected by the power button flex. Also TG0B and TG0V are battery sensors that you shouldn't be seeing either. Here's some relevant information from @flannelist's excellent iPhone Kernel Panics Wiki page..

To get to cause, keep reading past the panic string to find the missing sensor.

• PRS0 and Mic1 are genrally part of the charge port flex.
• Mic2 is in the power button flex in most models.
• TG0V and TG0B are a function of the battery. For the 11 Pro and Pro Max, these may also point to a bad charge port flex due to the second connector on these batteries.

At this point you appear to be looking at defective parts on the charging port assembly, the power button assembly, and the battery. To be honest, if it was my phone I would try replacing those parts, but unfortunately there's another explanation for the huge number of errors you're seeing, and it's not good.

It's entirely possible that the interposer, the part that connects the two boards that make up the logic board, has broken loose and damaged/disconnected some of the signals that are supposed to be passed between layers. While that kind of damage is repairable, it requires specialized equipment to separate the boards, fix any broken traces, reball the solder pads and then heat the entire assembly to solder it back together again. Definitely a job for a board repair house; I think of myself as a fairly expert DIY repair guy but I'd never even consider trying that repair.

Okay João, here we go. Based on the sensor information in your panic log, the following assemblies are affected

Part: iPhone 11 Battery: Replacement Part / Repair Kit

Guide: iPhone 11 Battery Replacement - iFixit Repair Guide

Part: Amazon.com: Power Button Flex Cable for iPhone 11- On/Off Keyboard and Flash Light Ribbon with Metal Bracket Holder Replacement Part : Cell Phones & Accessories

Guide: Manuales / Apple iPhone 11 / Power button, flash and top microphone

Part: iPhone 11 Lightning Connector Assembly

Guide: iPhone 11 Lightning Connector Assembly Replacement - iFixit Repair Guide (Note, video guide only)
Charge connector iPhone 11 repair - Free guide - SOSav (Step-by-step guide)

You'll also want to buy precut screen adhesive to resecure the screen after you've finished. I suggest you buy two, as it's all too easy to make a mistake and end up with a tangled ball of adhesive. If that happens you don't want to wait until your reorder comes in before you can put your phone back together, so having a backup is a good idea.

Also note that if you purchase through iFixit, you can get something like the battery with a "Fix Kit" that comes with adhesive and the tools needed to do the job. The extra cost is minimal and well worth it.

Although I heartily support iFixit and their repair efforts, I recognize that their prices can usually be beaten by shopping around at places like AliExpress, Amazon and eBay, so feel free to get your parts wherever it works best for you. Keep in mind, though, that their parts are generally of the best quality, and are usually genuine Apple, so you're guaranteed to get a good, quality part.

Finally, keep in mind that per my previous caution, replacing these parts may not fix your phone if the problem is a motherboard separation issue! However, since it's unlikely that repairing the logic board itself is within your capabilities (at least I assume it isn't), this is going to be your only hope at repairing your phone yourself. If you don't want to take the chance that replacing these parts doesn't fix your phone, then you would probably be better off taking it to a repair shop experienced in board level repairs.

I sincerely hope this helps and would really like to hear how everything turns out. Best of luck, João!

Press and quickly release the volume up button. Press and quickly release the volume down button. Then, press and hold the side button until you see the recovery mode screen. You will then need to connect your iPhone to your Mac or PC and open iTunes and when prompted press restore. If that does not work you may have a bad battery. Hope this helps!

Edit: You should not need the panic log to solve this problem FYI.

Owen