Set Appliance State:

Mains Power Off
Set Multimeter to AC Volts Set meter to measure AC Volts
Boiler Thermal Store must NOT be at maximum temperature
Models with Programmer: Rocker Switch to Continuous
Models without Programmer: Rocker Switch to On
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure Mains Voltage across Connection 6 (White) of the Full Sequence Ignition Box and the Appliance Neutral Connection.