Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Disconnect plug marked CON6 at the PCB

Measurement:

Check for continuity (zero resistance) between the grey wire marked EC1 at the right hand terminal block to the grey wire at the disconnected plug.
Check for continuity (zero resistance) between the white wire marked EC2 at the right hand terminal block to the white wire at the disconnected plug.
Inspect harness and connectors for good overall condition.