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If the Venturi was blocked would the boiler still work when the case is removed?

Help, Im getting the S33 code again despite changing the air pressure switch twice. I have been getting an S33 code on my 5 year old Vaillant Turbomax Plus, I had the air pressure switch replaced and it worked perfectly for 6-months then it went again, same code "S33". So I called out the...

The boiler does not ignite, neither for hot water nor heating, After a few seconds of switchingit on an 'S33' code comes up (this code stands for 'check air/flue system'). I had this problem 4 months ago, and was told to replace the air pressure switch - I did this and it solved the problem...

Thanks for that Chrishut. Is this something that I'll need an engineer to fix (if so how much is it likely to cost??) or is it relatively simple, that I might be able to do?

Hi I wonder if somebody can help me. I have a vaillant Turbomax boiler which is about 4 years old. It worked perfectly for 3 years but now causing problems. It tends to switch off every now and then and in the info display reads a code of \\\"s33\\\" - which stands for - \\\"check flu/air...