Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Disconnect X1 from the PCB

Measurement:

Check for continuity (zero resistance) of the blue and brown wires running from the wires marked Pump L and N to X1 on the PCB.
Brown = X1 Pin 5
Blue = X1 Pin 6.
Inspect harness and connectors for good overall condition.