Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Prepare the boiler for a combustion test as per the manufacturer’s instructions (refer to adapt for guidance)
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

Carry out a combustion test as per the manufacturer’s instructions.
Please refer to adapt for guidance.
Note:
A calibrated combustion analyser must be used for this test.