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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...

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...