Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Disconnect connector plug from gas valve

Measurement:

Test 1:
Measure the resistance between the top and bottom pins of the gas valve.
Expect a resistance of approximately 4.2Kohms.
Test 2:
Measure the resistance between the top and middle pins of the gas valve.
Expect a resistance of at least 1 Mohm or greater.