Set Appliance State:

Mains Power Off
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

F 10 fault code is listed as spark generator fault but it can be displayed if power is interrupted at certain points in the ignition sequence which may happen more often while you are working on the appliance.
Is F 10 still displayed after power has been turned back off & on to the appliance?
F 10 CURRENTLY SHOWING - INVESTIGATE CAUSE
F 10 CLEARED - RETEST APPLIANCE