Set Appliance State:

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

Measurement:

Measure the resistance between the pins of the gas valve.
The resistance should conform to the table below:
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Test 1
Test 2
PinsResistance
(Test 1) 1 and 320-30ohms
(Test 2) 2 and 4 60-70ohms
After test don't forget
Isolate as per TOPs P4
and refit as necessary