Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
DHW Demand
Set Multimeter to Range Mode
(click on multimeter symbol for guidance)
(click on multimeter symbol for guidance)
Gas On
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure the Voltage between the Red wire on connecter X25 and a suitable earth.
Monitor the voltage as the burner ignites.
The voltage will fluctuate, it should go up to approx 10-12vdv on ignition then settle to approx 1-3vdc when flame is present (burner ignites)
Note:
It may be necessary to move connector X25 slightly to the right to expose the contacts for testing but the connector should remain in contact with the pcb to allow the boiler to operate.
Monitor the voltage as the burner ignites.
The voltage will fluctuate, it should go up to approx 10-12vdv on ignition then settle to approx 1-3vdc when flame is present (burner ignites)
Note:
It may be necessary to move connector X25 slightly to the right to expose the contacts for testing but the connector should remain in contact with the pcb to allow the boiler to operate.
Isolate as per TOPs P4
and refit as necessary