Set Appliance State:
Set Multimeter to DC Volts 
Turn Hot Water Tap On
Isolate Mains Power to appliance as per TOPs P4
Disconnect flame sense electrode lead at in line connector
Mains Isolator Switch (ON/OFF Switch) in ON position
Selector Switch in DHW Summer position
Hot Water Temperature Control set to Maximum
Disconnect flame sense electrode lead at in line connector
Mains Isolator Switch (ON/OFF Switch) in ON position
Selector Switch in DHW Summer position
Hot Water Temperature Control set to Maximum
Gas On
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
Once burner has established, measure DC voltage between flame sense electrode lead and a suitable earth point.
Note:
Lockout will occur after approximately 7 seconds after burner ignition.
Note:
Lockout will occur after approximately 7 seconds after burner ignition.
Isolate as per TOPs P4
and refit as necessary