d.27 Low

Boiler Fault Code d.27

Also written as D27 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code d.27 appears across 2 boiler brands and 22 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is displaying an internal status code that indicates a software or configuration setting is not currently being used, which should not affect the daily operation of your heating or hot water. (As reported on Glow-worm Ultracom hxi)

Pick your boiler brand for the d.27 fix

Glow-worm d.27 6 models Vaillant d.27 16 models

Source

Information for the d.27 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