70 High

Boiler Fault Code 70

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 70 appears across 13 boiler brands and 31 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is struggling to accurately measure the temperature of the water circulating through your heating system, which has caused it to stop working for safety reasons. (As reported on Vokera Linea HE)

Pick your boiler brand for the 70 fix

Alpha 70 13 models Baxi 70 2 models British Gas 70 1 model Chaffoteaux 70 1 model ECA 70 1 model Firebird 70 1 model Heatline 70 3 models Ideal 70 1 model Malvern 70 1 model Servowarm 70 1 model Viessmann 70 1 model Vokera 70 4 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 7 July 2026