BoilerFaultCodesBaxi E128 Fault Code
The Baxi E128 fault code means: your boiler started to heat up but the flame went out unexpectedly while it was running.. It appears on 3 Baxi models in our database.
Technical description: Flame failure (loss of flame during operation)
What causes the Baxi E128 fault?
This fault occurs when the boiler's control system loses the signal that a flame is present while it is already firing. The most common reason is that the flame sensing electrode has become worn or dirty and can no longer detect the heat, although it can also be caused by an unstable gas supply or a failing component preventing the gas from flowing correctly.
DIY fix possible
Check that your gas emergency control valve is fully openIf you have a prepaid gas meter, check that you have sufficient creditAttempt to reset the boiler by turning the selector switch to 'R' for five seconds
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Baxi models that show the E128 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Baxi E128 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 31 August 2026