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How can I fix my Ariston Boiler with error message A03?

How have an Ariston Boiler. I keep on getting an error message A03.... mostly in the morning. How can I fix it? How have tried to fix it by turning the switch off and on and thereafter pressing the reset button. However, all in vain. Please help.
VJ, May 2008
change the pc board

lloyd rivers, August 2008
I also have this problem code appearing. Did you manage to get your problem fixed?

Tina, June 2008
link Click here to see other fixes for Ariston.