A07 High

Boiler Fault Code A07

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code A07 appears across 4 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 has detected an issue with how the fuel is burning or how the main heat exchanger is performing, causing it to shut down for safety. (As reported on Potterton Powermax HE)

Pick your boiler brand for the A07 fix

Ariston A07 12 models Ferroli A07 3 models Potterton A07 1 model Vokera A07 6 models

Source

Information for the A07 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