BoilerFaultCodesBaxi 133 R Fault Code
Also written as 133R — same fault.
The Baxi 133 R fault code means: 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.. It appears on 2 Baxi models in our database.
Technical description: Interruption Of Gas Supply or Flame Failure
DIY fix possible
Check that your gas meter has credit and the isolation valve is openCheck if other gas appliances in your home, like a hob, are working correctlyPress and hold the 'R' or Reset button for five seconds to attempt a restart
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Baxi models that show the 133 R fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Baxi 133 R fault code information on this page is sourced and cross-checked against the official Baxi service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026