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Assuming it works OK when the door is slammed shut;
You have 1 of 3 potential problems:
1. The door hinges are failing & when you push the door closed, the latch isn't lining-up with the keeper.
You can test this by lifting the door slightly as you close it & the push it closed as you normally would.
If that works, you just need new door hinges.
2. The latch on the door is failing.
It might be loose, in which case it might just need the screws tightening-up, or it might be damaged & need replacing.
3. The keeper inside the machine, which the latch locks into, isn't working properly.
It might be loose & need re-locating or the screws tightening up.
The electric terminals might be corroded & need cleaning & possibly tightening-up.
The keeper might be faulty & need replacing.
The keeper is inside the machine & you will need to remove the access panels to get at it. DO NOT remove any panels or do any work on the machine until it has been unplugged from the power-supply.
Best of luck.
May be the lid switch is faulty. There would be switch which confirm the Door is closed. If the switch is fault the the lid lock will not get activated and the the machine wont run. Try to find the switch and replace it. If you bypass it then you wont be able to close the door because the the lid lock will get activated before you close it.
If you wish to get some details; check the site linked here. Pull up older posts. http://electro-medical.blogspot.com/
Did you check the wall power with another device? Water in your wall socket? Door close well, sign or door-locked come on?. Next if all fail - power off the machine from the mains and detach and reconnect all possible sockets; it could just be a loose connection somewhere....................
The door has to lock as a safety to allow the machine to run. There is a switch on most locks to tell the machine to power the motor. I would guess the lock solenoid has failed, or something has happened to the latch for the door.
Check your instruction manual to see if there is a childlock feature that has been activated.
Is there water in the machine or has it completely rinsed out?
If you switch the power off and wait a couple of minutes, can you then open the door with the power still off?
Well I'm sure you have power on machine if not check fuse located at rear of machine below lip.
Next step remove top cover a cheap saftey screw driver set
will do trick not standard drivers.Electrical drawing is located
inside,Photo copy,now locate a cheap multimeter for testing,
don't worry it's not rocket science.Look closely at cables notice all cables have numbers printed.If PWR lamp above switch is on proceed as follows.
Remove power from machine & test on the Ohms scale between
E111 & E113 if you have resistance great i can't remember value! Now put a bridge wire between E121 & E111with closed door should lock when machine is turned on ,if not you can test between V Volt scale ac & you should read about 30 Volts ac Between E113 &E111when you press door release button on front of machine.
Note the switch LB in drawing represents front door you can also
check across this on Ohms scale with no PWR.