Set Appliance State:
Set Multimeter to AC Voltage 
CH Demand
Isolate Mains Power to appliance as per TOPs P4
Mode Switch in LOW position
Remove plastic cover from gas valve
Mode Switch in LOW position
Remove plastic cover from gas valve
| WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure |
Measurement:
Allow the Fan to start and the Pilot to ignite.
Measure the voltage across the White spaded wire and the Black spaded wire on the Main Gas Valve Solenoid.
Measure the voltage across the White spaded wire and the Black spaded wire on the Main Gas Valve Solenoid.
Isolate as per TOPs P4
and refit as necessary