Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove the flame detection cap from detection electrode and
X3 connector from PCB
X3 connector from PCB
Measurement:
Measure for resistance across pin 8 (Black) X3 connector and
end of detection lead.
Expected resistance continuity (zero resistance).
end of detection lead.
Expected resistance continuity (zero resistance).
Isolate as per TOPs P4
and refit as necessary