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Ariston Error Code E02 now A77?

Boiler loses pressure frequently, especially when cold, E02 code keeps coming up. After repressurising the boiler it works for a while before pressure drops again, from 1.1 (ish) bar to 0.5 Have checked the overflow for leaks and the central heating pipe work. No sign of any leaks but the water is going somewhere, now boiler is saying A77 code Condensing trap full, are these two separate faults? any ideas?

CJ
February 2016
AristonHeating, Home Heating SystemsAriston Boiler Pressure Cold
E02: Condensate comes from the burner/flue area. Could a leaking heat exchanger (or closely associated pipework) also put water into the burner area?

A77: Could the condensate drain now be blocked with crud?

More stuff:

http://www.diynot.com/diy/threads/repressurised-pv-on-ariston-boiler-no-heating-or-water.350215/

And one oddball cause

http://fixfault.com/answers.php?id=1741

XXX
February 2016

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