Set Appliance State:
Mains Power Off
Set Multimeter to AC Volts 
Attach multimeter probes to the inline connectors on the gas valve leads (+ve brown lead -ve to yellow lead)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Reset lockout if necessary.
Allow fan to run and ignition sequence to commence.
After approximately 15 seconds is voltage present at the connections?
Expected voltage approximately 26 Volts AC
Note: Voltage will only be present for 2 to 3 seconds if burner does not ignite.
Allow fan to run and ignition sequence to commence.
After approximately 15 seconds is voltage present at the connections?
Expected voltage approximately 26 Volts AC
Note: Voltage will only be present for 2 to 3 seconds if burner does not ignite.
Isolate as per TOPs P4
and refit as necessary