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Error Message A 03 ?

Hi, I have just moved into new house and bolier has now stopped working with error message A 03. I am getting no hot water or heating. There is no manual in the house for the boiler. Does anyone have any ideas what is wrong or could anyone email me a manual. I cannot find a make or serial number but it does look quite old compared to the ones I have seen on the Ariston site.

Sarah
April 2012
AristonHeating, Home Heating SystemsError Stopped Working

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