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 the burner to ignite.
Measure for AC voltage across the gas valve modulating coil terminals. Does the voltage measured operate between approximately 12 vac (max) and 7.0 vac (min) as the dhw flow rate is altered via a dhw tap.
Measure for AC voltage across the gas valve modulating coil terminals. Does the voltage measured operate between approximately 12 vac (max) and 7.0 vac (min) as the dhw flow rate is altered via a dhw tap.
