D.96 High

Boiler Fault Code D.96

Also written as D96 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code D.96 appears across 3 boiler brands and 27 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has reverted to its original factory settings and needs its specific configuration data entered to work correctly with your heating system. (As reported on Vaillant ecoTEC)

Pick your boiler brand for the D.96 fix

Glow-worm D.96 8 models Heatline D.96 7 models Vaillant D.96 12 models

Source

Information for the D.96 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