Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Turn Hot Water Tap On
Gain access to PCB (use Insulation Mat as required)
Disconnect the flame sense lead from the ignition PCB
Disconnect the flame sense lead from the ignition PCB
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure the voltage between the disconnected spade at the ignition PCB and a suitable earth point.
Once the fan runs is approximately 200V AC now present?
Once the fan runs is approximately 200V AC now present?
Isolate as per TOPs P4
and refit as necessary