Set Appliance State:

Mains Power Off
Prepare the boiler for a combustion check as per manufacturers instructions.
Note: A calibrated combustion analyser must be used for this test.
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Carry out a combustion check as per manufacturers instructions.
(Refer to Adapt for guidance).