Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Disconnect the harness from the pressure sensor

Measurement:

Measure for continuity (zero resistance) between the ends of the black (pin 8), red (pin 9) and green (pin 10) wires, in turn, at connector X22 on the PCB to the black red and green wires at the disconnected plug
Inspect the harness and connectors for good overall condition.