We have just moved countries and left the safe locked open whilst moving. We are now can't get the door bolts to open? Is there a way to reset the combination with the door open and the bolts in the locked position?

Question edited for clarity.
Question moved to home Security - Safes.

You can't. You have to open the safe with the Emergency Key, the combination Dial or in your case with the Electronic Keypad.

STEP 2 - CHANGING THE USER CODE
1-Open the safe by following step 1.
2-Press the Green set up button (Located on the
back cover or the hinge side of the back door
cover), the LCD display will turn Blue.
3-Enter your new user code (1-8 digits).
4-Press the # key.
5-The LCD display will turn Blue and show IN.
6-The LCD display will briefly show your new code.
7-Your new user code is now set to open the safe
NOTE: It is highly recommended to leave the
safe door open and practice your new code
several times before closing the door.

Manual

https://www.manualslib.com/manual/1800698/Amsec-Dl4000.html#manual

..

question edited for clarity and removal of text message abbreviations :>)

So the girlfriend got inside first and took all the good stuff and left the door open with the locking bolts out and deployed? :>(

Page 3 of the manual. You press the red reset button and change the pass code to a new one. Change the batteries as well at the same time. This is the better manual. Other left below

https://docplayer.net/40344439-7803-paraguard-deluxe-electronic-digital-safe.html

INSTALLING BATTERIES
Open the battery compartment cover located on the inside cover of the door. Install the batteries as shown on diagram (4 AA
batteries). Close the battery compartment cover.
SETTING AND CHANGING PERSONAL CODE
1. Open the door and press the red button at the rear of the door. The yellow light will flash.
2. Set a personal code, input a 3-6 digit set of numbers.
3. Press "
*
" or "
#
" to confirm.
The yellow light will turn off, indicating the code was entered successfully.
Use the same procedure to change the code.
4. Test your code before closing the door.
USING YOUR PERSONAL CODE TO OPEN THE SAFE
Input your 3-6 digit personal code then press "
*
" or "
#
" to confirm. When the green light flashes, turn the handle clockwise to
open the safe.

OPERATING MANUALS

https://images-na.ssl-images-amazon.com > images
PDF
Thank you for choosing a Paragon Lock and Safe product. Paragon Lock and Safe (PL&S) warrants the ... www.paragonlockandsafe.com for return instructions.

• 
  

  83-SAF7751/7751 Deluxe Wall Safe Keypad

  https://images-na.ssl-images-amazon.com > images
  PDF
  Paragon Lock & Safe ED keypad operating manual. ------------. -------- ... 83-DT5919/7803 ParaGuard Deluxe -----. 83-DT5910/7501 Paragon Rifle Safe----.

Check the big spring at the top. sounds like it could be broken or has come un wound. if this spring is working you should be able to push the door up without the opener. Unlock the opener and see if you can push it up. If you can then your opener could be the problem.

Our tech at Quality gun safes wall safes and floor safes advise you to check the back of the safe door for a set screw. Remove this screw to lock the door. The screw prevents lockouts during shipping and in store displays.

Sentry's Customer Service Department is available Monday through Friday, from 8am - 6pm, Eastern Standard time. Our internet Frequently Asked Questions can be accessed on line 24 hours a day, 7 days a week at www.sentrysafe.com

You need to reset the lock, so it will be set to the correct handing (left or right hand door).

Open the door and extend the lock bolt. Remove the battery. Press the reset button three times and wait 20 seconds. Push and hold the lock button, while inserting the batteries. Hold the lock button until the bolt starts to move. Allow the lock to complete it's learning cycle.

Program a new code and test.

there are a few things that might have happened,, one thing is that the battery is almost dead and does not have enough power to fully retract the locking bolt, or the bolt motor itself has failed and is not pulling the bolt back far enough to let the handle move, or the bolt is dragging, or a broken drive gear. all these are very common problems and in the lockshop that I worked at we would get 2 of these calls a week.
there is one thing that you can try before you call a locksmith to come out and try and get it open. IF it is not bolted to the floor : try and gently lay the safe down on its side ( hinge side twords the floor -- door facing you ), now with the help of a helper,, have them hold the top or bottom of the safe about 5 inches off the floor and you type in your combo, just as the combo is finished and you know that the ' clicking ' sound is about to click, have them drop the safe to the floor,, the timing has to be perfect and this may in fact let the bolt fall back into the combo pack enough to open the door,, turn the handle quickly and open the door. if this works ( 1 in about 100 ) then set the safe upright again and with the door open lubricate all moving parts / replace the battery and test the lock 15 times ( do not close the door until you have tested the system many times ).
if this does not work then call your local locksmith ( safe tech ) and have them come out to service the lock. ( they most likely will need to drill a small hole under the dial and move the bolt out of the way and replace whatever has broken ).

c...

You may have the same problem as me.
The bolts in the opening side may have sheared off of the ratchet arm that pulls them into the door. It's a casting using inferior quality metal.
I was lucky. The problem was found when the door was open.
The only way to open the door will be to turn the safe (with everything unlocked) so that the hinged side is along the floor and try tapping the top so the bolts drop into the door (the bolts are joined together).
If the safe has been secured and cant be moved get a grinder and chop the hinges off. With the hinge side bolts withdrawn the door can be opened. Sentry doesn't do this spare, so a new safe is required.

A locksmith would try to replace the batteries. Sometimes you will get the green light but the batteries still will not have enough power to retract the latch.