Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
DHW Demand
Gain access to PCB (use Insulation Mat as required)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure the voltage between pins 1 and 2 (leftmost brown and blue) wires of X3 on the main PCB.
During the sparking stage of the ignition sequence mains voltage should be present.
Note:
Boiler will attempt to light three times before lockout.
Reset as required until test is complete.
During the sparking stage of the ignition sequence mains voltage should be present.
Note:
Boiler will attempt to light three times before lockout.
Reset as required until test is complete.
Isolate as per TOPs P4
and refit as necessary