Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Turn Hot Water Tap On
Gain access to PCB (use Insulation Mat as required)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Reset appliance if required (rotate selector switch to
'O' position, then rotate back to DHW/CH position).
Allow self-check to complete and boiler to commence its ignition sequence.
At the sparking stage of the ignition sequence measure for
mains voltage across the brown and blue leads of connector X17.
Note.
Appliance may enter lockout during this test, reset as required until test is complete.
'O' position, then rotate back to DHW/CH position).
Allow self-check to complete and boiler to commence its ignition sequence.
At the sparking stage of the ignition sequence measure for
mains voltage across the brown and blue leads of connector X17.
Note.
Appliance may enter lockout during this test, reset as required until test is complete.
Isolate as per TOPs P4
and refit as necessary