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Which is exactly what I've done so I don't see where the problem is. I'm OFTEC so I know where I can and cannot operate in terms of regs. I merely wanted my diagnosys confirmed. Thanks for the replys though guys.

Pretty sure the H/E isn't split, observed the F/E for the time I was there and no movement at all. The dripping only occours when the burner is on and no water has been seen around the boiler at all. What else could cause the flue to condensate and drip? I thought maybe the cowell could be...

My mate has a f/s Mexico slimline CF440 with an open vertical flue. He has noticed an odd smell around the boiler so I said I would take a look. The boiler operates fine and the flame appears to be constant and blue but there is a spitting noise coming from the burner around a minute after...