Set Appliance State:
Mains Power Off
Set Multimeter to AC Volts 
DHW temperature selector to high setting
Boiler On/Off switch Off
Boiler On/Off switch Off
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Boiler On/Off switch On.
Reset lockout if necessary.
Measure voltage across the flame sense electrode lead at the flame sense electrode and a suitable earth point.
Expected voltage, approximately 55 volts AC.
Note:
It can be difficult to test inside the rubber cover on the electrode, take care to ensure good contact is made.
Reset lockout if necessary.
Measure voltage across the flame sense electrode lead at the flame sense electrode and a suitable earth point.
Expected voltage, approximately 55 volts AC.
Note:
It can be difficult to test inside the rubber cover on the electrode, take care to ensure good contact is made.
Isolate as per TOPs P4
and refit as necessary