The hardware defect arises due to the cramped case of the console.
The tiny components of the console are fixed in the deficient space.
Moreover, the cooling fan system is also not effective.
Thence the long hours of playing the console makes it overheated.
This excess heat is not released easily and effectively.
That is why the dreaded 3 red lights error becomes visible and your console starts malfunctioning.
The overheating makes some internal changes in the console.
The graphics processor becomes loose.
Many times the soldering also becomes loose due to the excessive heat.
The visible effect is that you find three red lights flashing around the power button of the console.
This is the 3 red lights error due to which your console ceases to function properly.
Now you have to fix the error anyhow, because the problem will not be tackled unless and until you take the necessary move.
First of all, if your warranty is within the period, then give Microsoft the ring and ask them to repair your console.
They will repair your console for free of cost.
What you have to do is keep patience until the console is sent back repaired.
You have to be patient for a month to get your console back repaired.
However, if your warranty has run out and you are not ready to wait for a month, then referring a professional guide is the best option for you to fix the Xbox 360 3 red lights error.
Nevertheless, don't choose any guide blindly.
See that the guide should fulfill certain criteria.
It should not cost you more than $30.
It should provide you 24/7 customer support.
It should assure you a money back guarantee in case of failure of fixing the error on your part.
It should contain step by step easy to follow instructions with necessary video tutorials that will make your fixing a success.
Thus, be an independent learner to fix the problems of your favorite console once and for all and play without fear of any error.