Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect plug marked CON14 at the PCB
Measurement:
Measure the resistance between the blue and brown
wires at the disconnected plug.
Resistance should be between 1k - 1.3kΩ.
Note:
Gas valve plug may look different (no blank pins).
It is in the same location and resistances do not change.
wires at the disconnected plug.
Resistance should be between 1k - 1.3kΩ.
Note:
Gas valve plug may look different (no blank pins).
It is in the same location and resistances do not change.
Isolate as per TOPs P4
and refit as necessary