Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect connector ST16 from the PCB
Measurement:
Measure between the tip of the flame sense electrode and the white wire in the middle of connector ST16 (pin 11).
Note:
It may be necessary to clean the electrode to ensure a good connection.
Note:
It may be necessary to clean the electrode to ensure a good connection.
Isolate as per TOPs P4
and refit as necessary