70 High

Boiler Fault Code 70

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 70 appears across 10 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 detected a temporary technical issue that frequently relates to an internal communication error or a sensor detecting an unusual reading. (As reported on Vokera Easi-Heat I)

Pick your boiler brand for the 70 fix

Alpha 70 12 models Baxi 70 2 models British Gas 70 1 model Chaffoteaux 70 1 model ECA 70 1 model Heatline 70 2 models Ideal 70 1 model Viessmann 70 4 models Vokera 70 2 models Worcester Bosch 70 1 model

Source

Information for the 70 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