Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Turn Hot Water Tap On
Selector Switch to Hot Water and Heating
Gain access to PCB (use insulation mat as necessary)
Plug to spark generator reconnected after last test
Gain access to PCB (use insulation mat as necessary)
Plug to spark generator reconnected after last test
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Allow the fan to run.
5 seconds after the fan starts to run measure the AC voltage between pin 5 on connector X2 and the earth terminal X500.
200VAC or greater should be present for 5 seconds as power is supplied to the spark generator, there will then be no voltage for 15 seconds and then 200VAC should be present again for another 5 seconds (second ignition cycle).
The ignition / voltage cycle is repeated 5 times as the boiler tries to ignite before lockout occurs - reset the appliance if necessary.
Is the voltage measured as expected?
Note: Timings are approximate.
5 seconds after the fan starts to run measure the AC voltage between pin 5 on connector X2 and the earth terminal X500.
200VAC or greater should be present for 5 seconds as power is supplied to the spark generator, there will then be no voltage for 15 seconds and then 200VAC should be present again for another 5 seconds (second ignition cycle).
The ignition / voltage cycle is repeated 5 times as the boiler tries to ignite before lockout occurs - reset the appliance if necessary.
Is the voltage measured as expected?
Note: Timings are approximate.
Isolate as per TOPs P4
and refit as necessary