Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Turn Hot Water Tap On
Set selector switch to ch/dhw
Dhw temperature control to max
Dhw temperature control to max
Gas On
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Allow the boiler to execute its ignition sequence and sparking to commence.
Measure for AC voltage across gas valve modulating coil terminals.
Expected voltage approximately 12 vac.
Note:
Lockout may occur after one attempt to ignite.
Reset boiler as required until test complete.
Measure for AC voltage across gas valve modulating coil terminals.
Expected voltage approximately 12 vac.
Note:
Lockout may occur after one attempt to ignite.
Reset boiler as required until test complete.
Isolate as per TOPs P4
and refit as necessary