How much does it cost to fix boiler error code Section J?

Typical repair cost for the boiler Section J fault is £120-250 including labour.

Section J High

Boiler Fault Code Section J

Also written as SECTIONJ — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Section J appears across 2 boiler brands and 3 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 that it is getting too hot and has automatically switched itself off to prevent any damage or safety issues. (As reported on Baxi 105e)

Pick your boiler brand for the Section J fix

Alpha Section J 1 model Baxi Section J 2 models

Source

Information for the Section J 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