d.94 Low

Boiler Fault Code d.94

Also written as D94 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code d.94 appears across 3 boiler brands and 23 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is currently resetting its internal memory and clearing the list of previous error logs, which is a routine maintenance action rather than a sign of a new fault. (As reported on Glow-worm Flexicom 24c / 28c)

Pick your boiler brand for the d.94 fix

Glow-worm d.94 9 models Heatline d.94 6 models Vaillant d.94 8 models

Source

Information for the d.94 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