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How can I fix my ariston microgenus 24? Error code A79?

My boiler packed up and was showing error code E34/5 and I replaced the air pressure switch. The boiler started to work but then after a couple of minutes there was some 'steam' coming from behind the clock and the error code A79 - flue temperature exceeded.
Can anyone help?
shaz, January 2011
link Click here to see other fixes for Ariston Microgenus 24.