27 Medium

Boiler Fault Code 27

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 27 appears across 8 boiler brands and 43 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected an internal electronic communication error or a temporary sensor discrepancy and has paused operation for safety. (As reported on Vokera Linea HE)

Pick your boiler brand for the 27 fix

Alpha 27 22 models Baxi 27 6 models Ideal 27 2 models Intergas 27 3 models Main 27 2 models Potterton 27 4 models Viessmann 27 1 model Vokera 27 3 models

Source

Information for the 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 27 April 2026