Ferroli Optimal HE plus 18OV heat only boiler

Well, I'm back again, boiler has been up & running fine since new PCB, until today that is. Boiler is now, I'd like to say kettling but I don't think its that. It's more like bubbling as though you have put a straw in a glass of water & started blowing into the glass. That's the only way I can describe it. Very weird bubbling sound, but does not lock out, just vibrates really bad until I turn it off. Checked condensate & is ok, not frozen, changed all microbore pipes to 15mm recently, removed & flushed rads, checked flue & noticed that the top half (plastic) has corroded away, not convinced this would affect the boiler this much. Anyone got any ideas?? Cheers peeps
 
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Thanks Ian, disconnected the condensate earlier on to check if it was blocked & the pipes were clear. Did not check trap though, will check for blockages around that area. Cheers.
 
will be blocked further up, you really need a RGI to be honest, its not a DIY Job
 
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Like I said, I'm ex gas, being registered won't make any difference. Disconnected pipe from boiler to top of condensate trap, blocked with whitish sludge. Cleaned out & refitted, easy enough, working ok now. Thanks for making me go back & re- check.
 

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