Canon A630 lens will not zoom

The lens is normally retracted for safety about one minute after you press the button in Shooting mode . To have the lens retracted immediately after you press the button, set the retraction timing to [0 sec.].Choose [Lens Retract], and then choose [0 sec.].

Hey,
It sounds like you're having the same problem,
Here is a link
http://www.e18error.com/repair.html

It may be usefull,
good luck mate!

Lens errors are fairly common. Usually it's sand or grit interfering with the lens extension mechanism. Or the camera's been dropped with the lens extended. Or the camera has been powered on, but the lens had been blocked preventing its extension. Or the battery ran down with the lens extended ...

Here's some things that you can do to try to correct it. They only seem to work for less than 50% of the lens errors, but if the camera is out of warranty, they're worth a try:

http://camerarepair.blogspot.com/2007/12/fixing-lens-error-on-digital-camera.html

lens belt is crack replace it

the block is damaged ...see if the lens barrels are a little bent or something....

The E18 error is an error message on Canon digital cameras. The E18 error occurs when anything prevents the zoom lens from properly extending or retracting.[1] The error has become notorious in the Canon user community as it can completely disable the camera, requiring expensive repairs.
A quick internet search for "E18" + "canon" quickly reveals hundreds of similar complaints.
ConsumerAffairs.com reports that the "lens has a feature called bellows claw, which is a gear that physically extends and retracts the lens. A piece that holds the lens, the barrier plate, is not large enough and can sometimes cause the bellows claw to malfunction, resulting in a stuck lens". The result is a black screen that only contains the error message, E18. Another problem mentioned on the site blames a sticky iris in the lens, caused by grease entering inside from the microphones built into the lens. The buildup freezes up the ability of the lens to open.

It sound like a problem with the zooming mechanism (lens would not retract or extended) Press the power button on and hold it down while extending and twisting the telescopic zoom lens. It might fix your problem. In any case it could not make it worse Good luck!

It sound like a problem with the zooming mechanism (lens would not retract or extended) Press the power button on and hold it down while extending and twisting the telescopic zoom lens. It might fix your problem. In any case it could not make it worse Good luck!

Manually rotating sensor rotor inside camera and cleaning gear fixed the Canon "lens error" for me.  
I placed instructions with photo's here: http://www.avh.dds.nl/Fix-Canon-SD600-Lens-Error/

It sound like a problem with the zooming mechanism (lens would not retract or extended) Press the power button on and hold it down while extending and twisting the telescopic zoom lens. It might fix you problem. In any case it could not make it worse Good luck!