Set Appliance State:

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

Measurement:

Measure the resistance across the two terminals 80 and 81 on connector X1 on PCB (Black Wires) while fully depressing Gas Control knob.
Note: Objective of test is to prove operation of ignition microswitch on gas valve.