Interesting....can you post a picture of the magnet , I really can't visualize a magnet you can hang. LOL
This is what the people at Pullet Shut said, which confused the heck out of me:
Put black electrical tape over it (or something to make it always think it is 'dark'. When you open and close it, it won't do anything else. When you want it to work, take off the black tape/hoodie and it'll open at dawn & close at dark.
Sounds like they are covering the "eye" of the door, to make it not functional. Then are just using the magnet to open it. Uncovering the eye will let the door resume auto opening at dusk and dawn.
I have an Ador...all I have to do, when I want to manually open or close it, is to press the button.