dd.. Low

Boiler Fault Code dd..

Also written as DD — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code dd.. appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is signalling that it is currently working correctly to heat the water for your taps and shower. (As reported on Ariston Genus 24 MFFI)

Pick your boiler brand for the dd.. fix

Ariston dd.. 1 model

Source

Information for the dd.. fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026