Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Gain access to PCB (use Insulation Mat as required)
Disconnect CN200 from the ignition PCB
Refit wires to APS if you have not already done so
Disconnect CN200 from the ignition PCB
Refit wires to APS if you have not already done so
Measurement:
Measure the resistance between pins 1 and 3 at the disconnected plug.
Resistance should be short circuit (zero resistance)
Resistance should be short circuit (zero resistance)
Isolate as per TOPs P4
and refit as necessary