I have a sandleford safe es23 if i punch the code in the safe beeps until i open it with the keys and disconnect the batteries. What am I doing wrong

Install fresh batteries.
Press reset button on left side of door (may be covered with protective plastic cap), beep will sound.
Enter new 3-8 digit code, press * or # key, green light will come on to confirm new code accepted.
Manuals are available at https://www.sandleford.com.au/sandleford-manuals

Open the safe, press the red button located inside the door, the yellow light will go on indicating the code can be changed. Input the new code, then press A or B button, it shall be confirmed by two beeps indicating the new code has been accepted and stored. If the yellow light and buzzer beeps 3 times the code is invalid - try again

I would assume that you have to contact Sanford.. if not the crooks would be able to crack all safes with just a manual
A thumbs up would be greatly appreciated if this answer is helpful to you.

Find something long & thin, I used a screwdriver. Has to be at least as long as depth of safe. There are 2 holes in the back of my sandleford ES 20 safe. Insert screwdriver into hole on left & push in until it hits the door on the other side. You have to do the next bit blind, but feel around for reset button. Once you find button use screwdriver to press. Lock will beep & you then just have to put your new code in. Problem solved. Of course this method only works if there is nothing inside the safe getting in the way of access.
Once inside remove anything valuable & find somewhere secure to keep it. This method took about 30 seconds to gain access. I'd hate to think how quick a professional thief could open it.

what make of safe have you got?

I have a new N15115,ES20 electronic safe,it will not accept a change of password.when new password entered it only beeps once ???

I have locked my safe I think by entering the wrong code. can you please advise how I can set a new code.... I cannot find the book that came with the safe.... thanks

lost key know code cannot open

The operating instructions on the ES20 as per the crappy manual:

Open safe using emergency key provided

Insert batteries in the box inside the door

Opening the safe
a. pre-set factory code 159
b. input 159 (the yellow light will flash and the buzzer will beep), then press B or A button, the green light will be on, rotate the knob clockwise, pull outwards, the door is opened

Closing the safe: close the door, input the code (the green light will flash for 5 secs). Turn the knob anti clockwise, the control system will activate and the safe will be locked

Changing the code: open the safe, press the red button located inside the door, the yellow light will go on indicating the code can be changed. Input the new code (1-8 digits), then press A or B button, it shall be confirmed by two beeps indicating the new code has been accepted and stored. If the yellow light and buzzer beeps 3 times the code is invalid - try again

Emergency Key - store in secure place NOT inside the safe. Remove the override cover in the centre of the face of Safe (its a silver plastic panel with Sandleford Electronic Safe ES20 on it), insert override key (a cyclinder key) - hidden underneath the override cover panel - and turn anti clockwise, rotate the knob clockwise to open door

Changing the Battery - If the red and green light are on this indicates that the batteries are low and require changing. To ensure the batteries have been installed correctly test before closing the door

References:
1. Operating instructions EA Electronic Safe
2. http://www.secustar.com/products-en/estype-safe.htm