WT5075CW - LG Washing Machine Service Manual (repair manual). Page 39

The Door Lock Switch Assembly consists of a DC Motor, a Bimetal, a Protection PTC, Sensing Point.
It locks the door during a wash cycle.

- After the system turns on, the microprocessor sends a motor locking signal.
- 12V motor is working.
- Spring that connected with motor shaft is working.
- The hook that connected with spring is pushed out.
- Door lock is detected when switch sensing point is detected lock position.
- The motor stops.
- Door locked

The maximum, allowable number of impulse authorizations is 3

- Upon the third authorization of the impulse, the position of hook goes back to the door-open

position.

- Authorizing the impulse occurs in 4.5 seconds upon input for max performance and two

authorization processes are allowed at most.

- With a temporary stop, door automatically opens by hook moving after micom send open signal

and the power turns off – maximum of 3 times of the authorizing period 

- Upon the fourth authorization of the impulse, the position of CAM goes back to the door-close

position.