Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove the plug from the gas valve
Measurement:
Measure the resistance across the terminals of the gas valve.
Resistances should be approximately as in the table below.
Resistances should be approximately as in the table below.
| Resistance | Pin 1 | Pin 5 | 3.8 kohms |
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Isolate as per TOPs P4
and refit as necessary