Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
CH Demand
Gain access to PCB (use Insulation Mat as required)
Boiler mains switch ON
Boiler mains switch ON
| WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure |
Measurement:
Allow the ignition sequence to commence and burner to ignite.
Measure the voltage across the brown and blue leads at the diverter valve connector X6 at the PCB.
Measure the voltage across the brown and blue leads at the diverter valve connector X6 at the PCB.
Isolate as per TOPs P4
and refit as necessary