133 R High

Boiler Fault Code 133 R

Also written as 133R — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 133 R appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has tried to light several times but has been unable to establish a flame, often because gas isn't reaching the burner or the ignition sparks aren't working. (As reported on Baxi EcoBlue Heat)

Pick your boiler brand for the 133 R fix

Baxi 133 R 2 models

Source

Information for the 133 R 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