My 7.5kg Electrolux Washing Machine whent bang and

The most likely cause is a broken drive belt. You don't say if it is a front or top loader. For a top loader, pull the machine out, and drop the drain hose into a bucket to empty the machine. Tilt the machine against the wall. Have someone steady it and look underneath. You should see the motor and belt, although some are direct drive.

For a front loader, the belt is accessed from the rear of the machine.

Hi Janet.
see if this link helps you out.
My front loader Electrolux washing machine is on lock and can open it...

You will need to remove the drum and reset the alignment.
The cloth is struck and has jammed on the drum movement.
click this link: drum removal

Hello Elizabeth P Cochran - Try resetting the unit by unplugging it or flipping the household circuit breaker off. Wait approximately ten minutes and restart unit. If the door does not open, then it sounds like the washer is possibly experiencing a communication problem with the control board, wiring failure or faulty door lock. Contact a professional to move forward accurately to properly diagnose/repair unit.

take of lid unplug 1st and inside by lock area you will see the catch force that back and it,ll open

i would get the rubber bellow replaced asap as water will be running onto components causing short circuits

Turn the power off and leave for 5-10 minutes then turn on. This should release the door lock the problem could be the pump drain filter is blocked clean this and it should resolve future problems.

When this happened to our front loader washing machine, we had to unplug the appliance, wait, then replug it to reset and unlock the door.