Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
DHW Demand
Gain access to PCB (use Insulation Mat as required)
DHW Selector to Max
DHW Selector to Max
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Press reset to cancel purge cycle countdown.
Measure the voltage across connections 3 (blue) and 6 (orange).
Allow burner to ignite and establish, voltage should then
increase to approximately 13 volts DC.
Measure the voltage across connections 3 (blue) and 6 (orange).
Allow burner to ignite and establish, voltage should then
increase to approximately 13 volts DC.
Isolate as per TOPs P4
and refit as necessary