Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove the electrical connector from the gas valve

Measurement:

Test 1:
Measure the resistance between pins 1 and 4 on the gas valve.
Expected resistance approximately 7.3 Kohms.
Test 2: Resistance to Earth
Measure the resistance between pin 1 and the earth pin on the gas valve.
Expected resistance greater than 1 MOhm.
Note:
The pins on the gas valve should be numbered.