Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Measurement:
Remove the blue spaded wire and the black spaded wire from the pilot solenoid on the gas valve and measure the resistance across the solenoid.
The solenoid resistance should be approximately 2.1 KOhms.
The solenoid resistance should be approximately 2.1 KOhms.
Isolate as per TOPs P4
and refit as necessary