Electrolux WE170V Service Manual page 44

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the second pulse (which is only sent if everything is in working order) moves the cam to another
position, which causes the ratchet to return to its position and therefore release the interlock; the
contacts of the main switch are simultaneously opened.
Door open conditions
Before pulses are sent to open the door, the PCB checks for the following conditions:

the drum must be stationary (no signal from the tachometric generator)

the water level must not be higher than the lower edge of the door

the temperature of the water must not be higher than 40 °C.
 Automatic release device
In the event of a power failure, turn the appliance off at the ON/OFF button, solenoid fault, the bi-metal PTC
cools in between 55 seconds and about 4 minutes (with temperature of 65 °C) and therefore releases the
door.
 Solenoid protection
A PTC is connected in series to the solenoid to limit the current (and therefore any overheating) in the
following
cases:
 main circuit board triac short circuit
 many consecutive pressings of the start/pause button (more than 10 times)
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