Set Appliance State:

Gas Off
Isolate Mains Power to appliance as per TOPs P4
CH Demand
Using a 2.5mm Allen key, wind in the throttle, clockwise, until it is fully closed.
Then wind out, anti-clockwise, 7 full turns.
This is the factory setting and should ensure that the gas/air mix is within parameters
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow boiler to carry out its ignition sequence and ignite, does the burner ignite satisfactorily?
Note:
The combustion ratio max/min will need to be checked and adjusted following any procedure that affects combustion. If this is not possible then the boiler shall be isolated from the gas supply until such time that it can be confirmed as correct.