Has to be a hardware problem @
Littlemaster. If the laptop is only a year old, I'd think the most obvious thing to do is to take it back to where you purchased it and ask them for their advice. Don't fiddle with it until they've had a chance to advise you. Could be that other purchasers like yourself are experiencing the exact same problem, and the sales people may immediately know what the problem is and will be able to provide you with a solution.
If the laptop is older - or second hand and the supplier can't be found, when I did research I found the comments at the link below that may point to a solution. Looks as though the problem is one that is experienced by many people and Lenovo knows about it. Maybe you have to update some of the bios software where apparently the problem has been corrected:
https://pcsupport.lenovo.com/za/en/solutions/ht050867
Quote:Before replacing hardware for a noisy fan complaint, you must ensure that the machine is using BIOS 1.16 and EC 1.07 or newer. In BIOS 1.16 we changed thermal setting to reduce an annoying fan noise. This fix will be included in newer BIOS/EC releases as well.
What you need to do is to get the Lenovo online assistant - provide the assistant with all of your laptop info - and it will then give you the updates that are needed for your laptop and tell you how to install it.
You can start with this link and see where it takes you - it's currently on South Africa - but there should be one specifically for your region. Before you do this check first if you can get all of the references for your laptop like the serial and product numbers. They should be at the bottom of your laptop:
https://pcsupport.lenovo.com/za/en/solutions/ht003029