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 DHW position
CH temperature selector to Min
DHW temperature selector to Max
Remove the ignition control box from the gas valve
CH temperature selector to Min
DHW temperature selector to Max
Remove the ignition control box from the gas valve
| WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure |
Measurement:
Allow fan to run and ignition sequence to commence.
Test 1:
Measure the voltage from the top connection to neutral.
Expect 130v when sparking.
Test 2:
Measure the voltage from the bottom connection to neutral.
Expect 130v when sparking.
Note:
Voltage will only be present during sparking phase of ignition sequence if burner does not ignite, in may be necessary to reset the boiler.
Test 1:
Measure the voltage from the top connection to neutral.
Expect 130v when sparking.
Test 2:
Measure the voltage from the bottom connection to neutral.
Expect 130v when sparking.
Note:
Voltage will only be present during sparking phase of ignition sequence if burner does not ignite, in may be necessary to reset the boiler.
.gif)
Isolate as per TOPs P4
and refit as necessary