Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove connector CN2 from the main PCB
Remove the gas valve connector
Remove the gas valve connector
Measurement:
Test 1:
Measure the resistance between Pin 1 (Blue) on CN2 and the Blue on the gas valve connector.
Expect continuity.
Test 2:
Measure the resistance between Pin 2 (Brown) on CN2 and the Brown on the gas valve connector.
Expect continuity.
Also inspect the condition of the harness visually for general condition and any signs of damaged insulation.
Measure the resistance between Pin 1 (Blue) on CN2 and the Blue on the gas valve connector.
Expect continuity.
Test 2:
Measure the resistance between Pin 2 (Brown) on CN2 and the Brown on the gas valve connector.
Expect continuity.
Also inspect the condition of the harness visually for general condition and any signs of damaged insulation.
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Isolate as per TOPs P4
and refit as necessary