WA washer pump not activating

The most common reason for this is when you are using the switching power method to turn the washer on or off. If you are sure you are getting power to the unit correctly (and other factors such as fuses have been ruled out) have you checked to see if you have bridged the CONTROL inputs on the washer PSU. In the image a loop of tinned copper wire has been used.

Bridging the control inputs on washer PSU

These CONTROL connectors are only used to connect a device such as a telemetry receiver.

For more information download the manual from the product information page here.