Set Appliance State:

Connect FGA to the combustion test point
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Activate chimney sweep mode.
Click here for guidance or refer to ADAPT.
(If the combustion reading is not within the specified range and the integrity of the flue system and the combustion circuit seals have been verified and the inlet gas pressure have been verified, then it will be necessary to adjust the combustion rate of the appliance).
Adjust gas valve (CO/CO2 ratio) to the manufacturers specified values, refer to ADAPT for guidance / procedure.
Has it been possible to adjust the combustion readings to within the manufacturers specified range?