Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Disconnect the gas valve connection plug from the dual solenoid assembly on the Gas Valve

Measurement:

Test 1.
Measure the Resistance across the solenoid terminals identified as EV1 and COM.
Test 2.
Measure the Resistance across the solenoid terminals identified as EV2 and COM.
The Resistance obtained for both measurements should be approximately 900 ohms.