The Ariston AL1046TUK (CC12589) has a door release button that you press in order to release the door. This is quite an old machine and the chances are the push button assembly has worn. There is a link from the push button to the door interlock. This could have broken or the door interlock itself could have a fault. I cant offer a quick fix as this is a safety issue which should be tackled by someone who is qualified.
sentinel
March 2009