Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance

Measurement:

Check for continuity (zero resistance) between the brown wire at M1 on the PCB to the brown wire at the timer.
Check for continuity (zero resistance) between the blue wire at M1 on the PCB to the blue wire at the timer.
Inspect harness and connectors for good overall condition.