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Genus condensation trap?

I keep getting fault A77 on my ariston genus boiler when heating and water are on. The condensation trap keeps filling with water. I have to empty this at least twice a day, this is obviously causing the A77 fault, buy why dose the trap keep filling?
Peter, October 2011
Thanks Nick. Would this be the pipe leading to/from the trap?

Peter, October 2011
your condensate pipe must be blocked

nick, October 2011
link Click here to see other fixes for Ariston.