Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Turn Hot Water Tap On
Gain access to PCB (use Insulation Mat as required)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Reset boiler if required.
Allow the ignition sequence to commence.
Measure for AC voltage across pins 69 & 70 on
connector CN12 during the ignition phase.
Mains voltage should be present for approximately 5 seconds, this will then be present again after approximately 10 seconds. This will be repeated 3 times before lockout occurs, reset boiler as required until test is complete.
Allow the ignition sequence to commence.
Measure for AC voltage across pins 69 & 70 on
connector CN12 during the ignition phase.
Mains voltage should be present for approximately 5 seconds, this will then be present again after approximately 10 seconds. This will be repeated 3 times before lockout occurs, reset boiler as required until test is complete.
Isolate as per TOPs P4
and refit as necessary