Boiler service query.

[whistler]

I have a Vaillant Turbomax which is serviced annually.

My previous service engineer used to go outside and stick a probe into the flue, presumably to check exhaust gasses. However he has now retired and he recommended another engineer.

The new engineer doesn't go outside to check the flue, but I noticed that he seems to insert or attach a probe to the front of the gas chamber.

Are these different ways of doing the same thing?

 

[cross thread]

Yes, but the flue should be inspected outside