Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to mVolts DC 
DHW Demand
Disconnect flame sense lead cap from the sense electrode and leave in a safe position
Remove control box cover if necessary
Remove control box cover if necessary
Gas On
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure voltage between the end of the flame sense electrode and the neutral at the incoming mains terminal strip.
Expected voltage approximately 250 mV DC or greater.
Note:
Voltage will only be present for a very short time while the burner is alight so it is advisable to monitor the voltage over several ignition attempts. If the boiler locks out it will be necessary to reset it to continue testing.
Expected voltage approximately 250 mV DC or greater.
Note:
Voltage will only be present for a very short time while the burner is alight so it is advisable to monitor the voltage over several ignition attempts. If the boiler locks out it will be necessary to reset it to continue testing.
Isolate as per TOPs P4
and refit as necessary