Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect the plug from the gas valve
Measurement:
Test 1:
Measure the resistance between pin 8 (blue wire) at HV2 and pin 2 at the gas valve plug.
Test 2:
Measure the resistance between pin 9 (orange wire) at HV2 and pin 1 at the gas valve plug.
Test 3:
Measure the resistance between pin 9 (orange wire) at HV2 and pin 5 at the gas valve plug.
Expect continuity (zero resistance) on each test.
Measure the resistance between pin 8 (blue wire) at HV2 and pin 2 at the gas valve plug.
Test 2:
Measure the resistance between pin 9 (orange wire) at HV2 and pin 1 at the gas valve plug.
Test 3:
Measure the resistance between pin 9 (orange wire) at HV2 and pin 5 at the gas valve plug.
Expect continuity (zero resistance) on each test.
Isolate as per TOPs P4
and refit as necessary