Pressure Switch
(Washing Machine)
The pressure switch controls the fill valves, and in some cases will prevent the motor from going into spin. It operates via an internal diaphragm which triggers one or more switches (depending on the type of pressure switch). Water entering the drum as the machine fills gradually floods the pressure chamber and traps the air already in it. As the water level in the drum rises so the pressure on the air increases, this air is then forced up a small bore tube which connects both chamber and switch. When the correct pressure on the internal diaphragm is attained the corresponding switch is activated.
Associated Faults
  • Overfilling
  • Intermittent Over or Under Filling
  • Fill Valves Dead