Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
What color of light blinks when you enter the correct code, please? red, or green?
Do you hear any internal 'click' when the correct code is entered?
Do any lights show or any beep (for the keys) sound when and while you are entering the code?
That sounds normal, aside from the lack of a 'click' of the latch opening, and the flashing red lights.
I think that
A. your safe does not have low batteries, and
B. your code may be wrong, or have been changed.
That's a guess based upon what you have reported.
I understand your concern. And it's OK to resume tomorrow.
Thanks for letting me know.
(I regret that I am not able to offer Live Phone Call service at this time; However, your request is still open to other Experts in this category, and one of them may pick up on it at any time.)