d.80 Low

Boiler Fault Code d.80

Also written as D80 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code d.80 appears across 3 boiler brands and 41 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning This code is simply an information display showing the total number of hours your boiler has been running since it was installed; it is not an error and requires no action. (As reported on Vaillant ecoMAX 622)

Pick your boiler brand for the d.80 fix

Glow-worm d.80 8 models Heatline d.80 7 models Vaillant d.80 26 models

Source

Information for the d.80 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 31 August 2026