Zoom flashing the word ZOOM flashes on the speedlite display

SOURCE: Canon Speedlite 580EX Fault

same problem after a 30 cm falling on the floor. U must open the head of the flash and rearange the flash Bulb on the moving(zooming) track. images of how to u cand find HERE

SOURCE: My speedlite keeps flashing the zoom control and freezes

Make sure the built-in diffuser is pushed in all the way... that diffuser is only designed to work when in "14-mm" mode so whenever that diffuser is down, even just a little bit, the entire display will flash and 14 mm will be shown as the focal length of the flash.

SOURCE: Canon Speedlite 430EX zoom issue

You're gonna kick yourself, but here goes, you know that clear plastic wide beam shield on the front, make sure it's fully inserted or else the auto zoom won't work while it's in use, (or the flash thinks it's in use)

SOURCE: Only get one flash when using slave

Yeah you should go into the menu on your camera and see if there is anything you need to change!!

SOURCE: SPEEDLITE 580EX TTL Flash: flash is making a constant beating/clicking noise ...

Loosen the two small screws under the flash on the swivel head. Turn flash on. You may need to twist the head just slightly. Flash bulb moves back and forth in the swivel head when zooming. If you dropped the flash, this may have jarred it from the track. I had the same problem with mine, and the above solution fixed it. Zoom works again and no clicking noise. Let me know.