Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Turn Hot Water Tap On
Disconnect lead from gas valve and make safe
Selector Switch in Hot Water Position
Selector Switch in Hot Water Position
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Reset appliance as necessary.
During the sparking stage of the ignition sequence
measure for voltage between the red wire marked
2 and the violet wire marked 1 on X6 at the PCB.
Expected voltage approximately 280V DC.
Notes:
There may be voltages present before or after the
sparking stage of the ignition sequence but these
voltages are not relevant to this test.
Sparking on this appliance can be very quiet, to confirm when appliance is in sparking stage of ignition sequence you may need to remove the combustion chamber to see the sparking.
During the sparking stage of the ignition sequence
measure for voltage between the red wire marked
2 and the violet wire marked 1 on X6 at the PCB.
Expected voltage approximately 280V DC.
Notes:
There may be voltages present before or after the
sparking stage of the ignition sequence but these
voltages are not relevant to this test.
Sparking on this appliance can be very quiet, to confirm when appliance is in sparking stage of ignition sequence you may need to remove the combustion chamber to see the sparking.
Isolate as per TOPs P4
and refit as necessary