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 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning This is a normal operational message indicating that the boiler is currently heating water for your taps or shower. (As reported on Ariston Genus 27)

Pick your boiler brand for the dd.. fix

Ariston dd.. 3 models

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 27 April 2026