need model number or product number
disconnect from the mains for 10 min.open the filter and drain the water out.now try opening the door.If it is still stuck try banging the door where the handle is fast/repeatedly to see if it releases.if that fails lid off and release from behind.Electrolux telling you it needs resetting is STRANGE!!!.some models had issue with door locks doing this and door lock needs to be replaced with a new one once you get the door open
ck
February 2012