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

Most common meaning This is not a fault; it is simply a diagnostic screen displaying how many hours your boiler has spent running the central heating. (As reported on Vaillant ecoTEC)

Pick your boiler brand for the D.80 fix

Glow-worm D.80 8 models Heatline D.80 7 models Vaillant D.80 30 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 7 July 2026