No problem about the delay
This is almost certainly a failed solenoid in the dispenser. This is what actually opens the flap.
Disconnect from the power. Undo the screws around the door and the front door panel comes off.
You will see the dispenser, its wiring and the fixings. Make a note of the wiring, or take a photo.
If you have a meter you should test the solenoid and if its open circuit you will need to replace the dispenser
Please go here
for the spare. Just click on the word in blue.
Replacing it is just a matter of undoing the retaining screws and swapping over the wiring
If you need more help, please just ask. In the meantime,
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