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Mend Ariston CLAS HE System C54 Boiler Heating

ariston clas he system c54?

Hello, we have an Ariston CLAS HE System. Has been working fantastic for a few years now. But today we have hot water but no heating. The display panel on the boiler is showing c54 (lowercase c) any ideas what the problem might be? Thank you in advance.

Mike Green
February 2011
AristonAriston CLAS HE System C54D.I.Y, PlumbingBoiler Heating Ariston

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Ariston CLAS HE System C54 Error - No Heating