Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect gas valve plug from PCB (rightmost plug)
Measurement:
Test 1:
Measure the resistance across the brown and
blue wires at the disconnected plug.
Resistance should be approximately 4.3k - 5.3kΩ.
Test 2:
Measure the resistance at brown wire at the
disconnected plug to a suitable earth point.
Resistance should be greater than 1MΩ (or O.L).
Measure the resistance across the brown and
blue wires at the disconnected plug.
Resistance should be approximately 4.3k - 5.3kΩ.
Test 2:
Measure the resistance at brown wire at the
disconnected plug to a suitable earth point.
Resistance should be greater than 1MΩ (or O.L).
Isolate as per TOPs P4
and refit as necessary