Set Appliance State:

Gas Off
Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to AC Volts Set meter to measure AC Volts
CH Demand
Gain access to PCB (use Insulation Mat as required)
Remove connector CN09 (pump cable) from the PCB and make safe
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

After 10 - 15 seconds measure for AC voltage on
pins 3 and 4 where connector CN09 was fitted.
Expect mains voltage.