Have a Defiant electronic deadbolt that came with house with no instructions & codes

moved you to home locks ,random
it is not a car.
no model lock told. either makes answers hard.
does it have batteries. , if yes check those.

I would recommend taking the deadbolt back to wherever you purchased it from and exchanging it for a new one. It sounds like you got a defective unit.

Just so there’s no confusion, this website is a general question-and-answer site for anyone who needs help fixing something. It’s not the customer service website for the manufacturer or retailer you got your deadbolt from. I do not represent the manufacturer or the retailer. I’m just a random guy on the internet trying to help out. :)

I only saw manual mentioned on suspicious or malicious websites/

Sometimes manuals appear for sale on eBay.com or Amazon.com.

Home Depot could be contacted for a manual, as it is their brand name.

Searching for a youtube video might help you.

Example:
https://www.clipzui.com/video/u3q464q2u3z4p4m4162524.html

Electronic Deadbolt Door Lock Install Defiant clipzui com

My lock did not have jumpers, but adjusts itself automatically... You have to hold the lock button in (on the exterior side) while you insert the battery pack - the deadbolt will cycle in and out, then beep a couple times. You'll be holding button for maybe 10 seconds.
I have to say while this step is included in the instructions in a big red box, it says nothing about why or what its doing, so I imagine many people miss this...

Here is a link to the installation and programming instructions for kwikset Powerbolt:

http://s7d5.scene7.com/is/content/BDHHI/kwikset-smartcode

Here's the main product page:

http://www.kwikset.com/Products/Categories/Electronic-Locks.aspx

how do i change code

Take the back off of the deadbolt where you install the batteries. The instructions are inside.

Take the cover off the back of the unit where you are supposed to install the batteries. The instructions should be inside the cover. Hope that helps.