How much does it cost to fix boiler error code 70?

Typical repair cost for the boiler 70 fault is £90-180 including labour.

70 High

Boiler Fault Code 70

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 70 appears across 4 boiler brands and 21 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 communication error between its internal temperature sensors, which means it cannot safely monitor the water temperature and has shut down as a precaution. (As reported on Alpha E-Tec, E-Tec Plus, Evoke)

Pick your boiler brand for the 70 fix

Alpha 70 15 models Chaffoteaux 70 2 models Vokera 70 3 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 27 April 2026