F13 High

Boiler Fault Code F13

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code F13 appears across 7 boiler brands and 45 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's internal temperature sensor has stopped sending the correct information to the control board, preventing the system from operating safely. (As reported on Ferroli Modena HE)

Pick your boiler brand for the F13 fix

Ferroli F13 13 models Glow-worm F13 12 models Ideal F13 3 models Intergas F13 3 models Johnson Starley F13 6 models Saunier Duval F13 6 models Vaillant F13 2 models

Source

Information for the F13 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