When Pyrolytic cleaning an oven or cooker the temperatures inside the oven reach over 400 degree Celsius obviously these temperatures are very dangerous so the oven with automatically lock the door to prevent the door from being opened until the oven is cool enough to not be a danger.
There are a number of way the oven can automatically lock the door using either a wax actuating lock, synchronous motor locks or solenoid locks.
The wax actuator uses heat to expand wax within the lock this expansion pushes on an internal mechanism with pushes a pin to lock the door in the closed position, when the wax cools the pin will retract again and the door will be unlocked and able to open again.
Synchronous motors use the motor to turn the lock to the closed position when the motor receives the signal to do so, when the oven has cooled the motor will open the lock as well. There could be a microswitch as well to signal to oven PCB that lock is engaged or not , this should be tested for continuity as well to ensure its functioning.
Solenoid lock uses signals from the PCB to power the solenoid operated lock ,this also may have a microswitch to signal correct operation of the mechanism, you can test the winding to ensure it has continuity and to ensure the correct resistance measurement.
Common problems
Can be caused by component failure or damage , this can also cause secondary damage for example if the lock stock open and the door slammed it could break door frame so inspect prior to replacing any components. You can test the motor and windings of solenoid valve and visually inspect for damage.
Buy cooker oven spares on Ebay UK here
Buy a good Multimeter on Ebay UK here
How to remove a cooker oven door video below
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