Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Gain access to PCB
Remove connector from pump

Measurement:

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