If the door has a wooden front on it, then you will probably find that either at the top or bottom of the frig. door pivot there is a screw actually at the top or bot. Unscrew it out and the door will come loose, slide the door off the wooden door brackets, which will leave the wooden door still attached to the carcase. This can then be removed like an ordinary cupboard door.
If you mean some other type - then I cannot help you. Cheers Hard@it