Set Appliance State:

Mains Power Off
Mode selector switch to Off/Reset position
Turn Hot Water Tap ON
Set Multimeter to AC Volts
Hot water temperature control set to maximum
To perform this test safely remove the ignition PCB from its cradle and refit
in the upturned position with the terminals exposed and facing the main PCB
Gas On
WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure
Mains Power On

Measurement:

Mode selector switch to DHW position.
Allow fan to fun and ignition sequence to commence.
Measure voltage at the live connection (brown wire) on connector 2 on the ignition PCB and a suitable neutral.
Mains Power Off.
Refit PCB in correct position.
Notes: Connectors are numbered left to right with 2 being furthest from the two pin connector on the left.