Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
No Demands
Ensure boiler is not in lockout condition
Ensure boiler is not in lockout condition
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure the voltage between connector X1 (flame rectification lead) and the neutral at the incoming mains terminal strip.
Expect approximately 160 vac.
Expect approximately 160 vac.
Isolate as per TOPs P4
and refit as necessary