Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
CH Demand
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Allow burner to ignite.
Measure the voltage between the black and blue pins on connector CN9 or CN08 (dependent on which version main PCB is fitted)
Expect mains voltage.
Measure the voltage between the black and blue pins on connector CN9 or CN08 (dependent on which version main PCB is fitted)
Expect mains voltage.
Isolate as per TOPs P4
and refit as necessary