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How can I open front cover of Ariston ?

I got ariston micro genus 24 boiler with error code A77. how should I do with please?
jason cheng, February 2010
you can find it in the installation manual
to find out which manual use the link below;
http://www.ariston.co.uk/ariston-product-manuals/discontinued-products/0000000001/0000000002/

emma, December 2010
Might be condensate sensor or low circuit pressure. There is no documentation from Ariston. Press reset buttong and hope for the best.

steve, February 2010
link Click here to see other fixes for Ariston.