Smarter Heating & Hot Water

Main Fault Codes

Display codes for Main boilers.

Back to fault codes

FaultcodePossible FaultUser ActionModel Specific
E20Faulty componentsYou should make a note of the displayed error code and contact your installer or Baxi Customer SupportMain
E28Faulty componentsYou should make a note of the displayed error code and contact your installer or Baxi Customer SupportMain
E50Faulty componentsYou should make a note of the displayed error code and contact your installer or Baxi Customer SupportMain
E110Displayed overheat of the primary water or flue system has occurredTurn the selector switch to the reset position and hold for at least 5 seconds. If the boiler does not relight, or the code is displayed regularly contact your installer or Baxi Customer Support.Main
E119Displayed when the primary water pressure is less than 0.5 barYou can repressurise the boiler yourself. You can watch a video to find out how to do it hereMain
E133Indicates that the gas supply has been interrupted, ignition has failed or the flame has not been detectedEnsure that the gas supply has not been turned off, and turn the selector switch to the reset position and hold for at least 5 seconds. If the boiler does not relight, or the code is displayed . Regularly contact your installer or Baxi Customer Support.Main
E133Can also display in the winter if the condensate pipe of your boiler has frozenThe boiler will switch off to protect itself. You can find out how to thaw your condensate pipeMain
E160Faulty componentsYou should make a note of the displayed error code and contact your installer or Baxi Customer SupportMain
E168Could mean that your boiler has detected a problem but can't work out exactly what it is.Ê This could be because the boiler has been reset after developing a fault or because there has been an external issue, such as a fault with the electrical supplyThe boiler might have been displaying a different error code prior to resetting, so it is useful to make a note of any error codes you see as this will help your installer identify the issue.Ê Call your installer or Baxi Customer Support if E168 persists.Main

Gas work stays with a Gas Safe registered engineer. Some codes only apply to a named range — check the model column.