Cp12 fail advice

[Charles Muscat]

Hi I've had a cp12 gas safe test done on my boiler and it's failed and he's capped off the boiler because he said that the combustion gases are mixing with the air intake. He's not told me what might be the issue though and I'm struggling to find anyone else referencing this as a possible fail. Would anyone be able to tell me what the possible causes of something like this might be so that I can contact a gas safe engineer to remedy the problem. I would rather know the possible issues/solutions before calling someone in case the solution is more costly than replacing the boiler. Thanks for any advice or explaination of what this could be.

 

[Anon_E_Mouse]

Probably either a split in the inner flue, or flue seal gone. You won't know which without further investigation by a Gas Safe engineer.

 

[Charles Muscat]

Thanks for replying. If the flue has a split in it, is it repairable or would it be best to change the whole flue? Do you think it might work out cheaper for someone gas safe to replace the whole flue rather than investigating for a faulty seal or a split?

 

[Anon_E_Mouse]

If the flue is split then yes you'll need a new flue. Is the flue horizontal or vertical? What make is your boiler?

 

[Charles Muscat]

Ok thanks for the info. Horizontal, baxi platinum combi 28.

 

[Anon_E_Mouse]

New flue time I'm afraid. Quite a simple job. Baxi flues are known to split after a few years.

 

[Charles Muscat]

Doh is that a common fault with them then? Am I correct in thinking that it'll just need a standard baxi flue? I looked it up on Screwfix and Toolstation, it's about £105 + engineer labor

 

[Anon_E_Mouse]

Yes standard flue and labour. The flue has a plastic pipe inside the outer pipe to keep the gap, metal spacers are used that eventually make a hole in the inner flue.

 

[Charles Muscat]

Thanks soo much for your advice, really appreciate it! I'll start ringing around next week for quotes then, hopefully won't be too much : )

 

[Anon_E_Mouse]

You're welcome.