Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Disconnect X1C 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 X1C on the PCB.
Brown = X1C Pin 1
Blue = X1C Pin 2.
Inspect harness and connectors for good overall condition.