Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4

Observation:

2022 V5
The route and position of the flue can vary greatly between installations.
Consult:
Manufacturers Installation Instructions and TOPs C5: Chimneys to confirm correct installation.
A good flue system is vital for to the proper functionality of the boiler.
Fully inspect the flue along its length including all seals.
Ensure the flue terminal is clear, in good condition and its position
is correct.
Check the flue in its entirety.
Make sure that all the seals are intact and in good condition and the flueways are clear and undamaged.
Isolate Mains Power to appliance as per TOPs P4