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The door lock, also known as the interlock, is a safety mechanism used on front load washing machines and on some top load washers that prevents the door or lid from being opened while the machine is in operation. The system consists of a door mounted catch and a door lock mechanism located on the back of the front panel/door shroud or main top. The lock mechanism consists of some switches and normally a lock/unlock solenoid or wax motor solenoid. When the cycle is started, the washer control will activate the lock solenoid/wax motor to prevent the door or lid from being opened. At the conclusion of the cycle, the control will activate the door unlock solenoid or will deactivate the door lock wax motor. The wax motor style of solenoid normally takes at least a minute or two to activate or deactivate. If the door or lid won’t open at the end of the cycle, then the lock mechanism may be at fault. Most washers will have a manual release to unlock the mechanism and allow you to open the door or lid. The release is normally accessible from below the door lock, or on some models, from inside the soap dispenser housing.

Some models will have a digital display that will show a fault code in addition to the door or lid not opening. Once the door or lid has been opened you can then access the door lock assembly to check for a defect. On front load washers, you will need to either raise the main top or remove the front panel to gain access. Check for signs of a solenoid or wax motor overheating or a mechanical defect in the assembly. You can also check the door lock switches and the solenoids for continuity with a multi-meter and replace any that are found defective, however most door lock mechanisms are available only as an assembly. On top load washers you will need to raise the main top to gain access to the door lock mechanism. Remove power from the appliance before attempting service and never bypass a door lock safety mechanism.

http://www.ifixit.com/Answers/View/161883/How+to+open+top+lid+on+MayTag+Bravo+Washer+300+series

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