Set Appliance State:
Mains Power Off
Set Multimeter to AC Volts 
Turn Hot Water Tap On
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Reset appliance as necessary.
Allow burner to ignite and establish.
Monitor the voltage between pin 2 (blue) at J2 connector
on the ignition PCB until the boiler starts to cut out.
Is constant mains voltage present or does it drop out during the test?
Allow burner to ignite and establish.
Monitor the voltage between pin 2 (blue) at J2 connector
on the ignition PCB until the boiler starts to cut out.
Is constant mains voltage present or does it drop out during the test?
Isolate as per TOPs P4
and refit as necessary