Pressure Switch - GE WSSH300G Technical Service Manual

The door lock assembly is made up of a coil, door switch,
switch actuator, locking fork, wax motor, auxiliary switch
and spin lock arm.
Locking
Locking
Switch
Switch
Fork
Fork
Actuator
Actuator
Contact
When a cycle is selected and the start pad is touched,
the control board applies power to the coil. The magnet
field of the coil pulls the locking fork down and tries to
pull the contacts of the door lock switch closed. If the
washer door is open, a tab on the switch actuator
prevents the contacts from closing and the locking fork
will not allow the door to be closed until the stop pad is
touched, removing current from the coil. When the
washer door is closed, the door strike pivots the switch
actuator out of the way allowing the magnetic field of
the coil to close the contacts of the door lock switch
and the locking fork locks the door. The wax motor
and spin lock arm are used to prevent the door from
being opened while the spin basket is still spinning.
Power is applied to the wax motor when the washer is
in spin. When power is applied to the wax motor, it
expands its piston within 30 to 40 seconds driving the
spin lock arm between the locking fork and the switch
actuator holding the locking fork down. At the same
time, the piston closes the door lock auxiliary switch
allowing the washer to go into spin. When power is
removed from the wax motor, it takes about 90 seconds
for the wax motor to cool down and retract the piston,
pulling the spin lock arm back away from the locking
fork and auxiliary switch. This provides enough time for
the spin basket to slow its rotation down to the wash
speed before the door could possibly be opened.
Spin
Spin
Lock
Lock
Arm
Arm
Auxiliary
Contacts
Coil
Wax Motor
13

Pressure Switch

The pressure switch is mounted to the right side panel
under the top of the washer and controls the water level
in the washer.
The pressure switch is made up of a single pole, double
throw switch, but only contacts 1 and 2 are used. The
contacts are controlled by a bellows inside a sealed
chamber. The chamber is connected by a hose to the
air bell located at the bottom of the washer attached to
the drain boot. L 1 is applied to the pressure switch by
the control. If the water level is below 1/2 inch from the
bottom of the spin basket, contacts 1 to 2 of the pressure
switch close applying power to one side of the (3)
solenoids of the water valve assembly. The other side
of the solenoids are connected to neutral by relay
contacts on the control board. When the cycle calls
for water, depending on the water temperature selected
and the increment of the cycle, the control board
connects one or two of three the solenoid coils to neutral,
activating the water valve solenoids. When the
corrected water level is reached contacts 1 and 2 open,
signaling the control to remove neutral from the
solenoids.