Set Appliance State:

Gas Off
Set Multimeter to Resistance Set meter to measure resistance
Isolate Mains Power to appliance as per TOPs P4
Limit switch and FDC assembly is located top left behind the sealing panel

Measurement:

Remove the red and brown leads from the right hand side of the limit switch FDC assembly terminal block. Measure the resistance across the remaining red and brown leads in the terminal block. Resistance should be closed circuit.
Reconnect leads after test.