Set Appliance State:
Gas Off
Set Multimeter to AC Volts 
CH Demand
Isolate Mains Power to appliance as per TOPs P4
Gain access to pcb (use isolation Mat as required)
Boiler On/Off Switch On
Gain access to pcb (use isolation Mat as required)
Boiler On/Off Switch On
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Reset lockout as necessary.
Allow ignition sequence to commence.
Measure the voltage at connector CN1 connection 8 (brown wire) on the ignition PCB to a suitable neutral.
Approximately 8 seconds after the fan starts mains voltage should be present for 3 to 5 seconds. This should repeat 5 times before boiler locks out, with approximately 5 seconds between attempts.
Note:
To reset the boiler switch the boiler On/Off switch Off then back On.
Allow ignition sequence to commence.
Measure the voltage at connector CN1 connection 8 (brown wire) on the ignition PCB to a suitable neutral.
Approximately 8 seconds after the fan starts mains voltage should be present for 3 to 5 seconds. This should repeat 5 times before boiler locks out, with approximately 5 seconds between attempts.
Note:
To reset the boiler switch the boiler On/Off switch Off then back On.
Isolate as per TOPs P4
and refit as necessary