BoilerFaultCodesBaxi E128 Fault Code
The Baxi E128 fault code means: your boiler's flame has gone out because air has entered the gas pipes or the gas supply is not steady enough to keep it running.. It appears on 1 Baxi model in our database.
Technical description: air in the gas supply
DIY fix possible
Check if other gas appliances, like a cooker, are working properly to confirm gas supply.Press and hold the 'R' or Reset button for at least five seconds.If the fault persists after three reset attempts, you must call a Gas Safe engineer.
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A cover plan would handle faults like E128: no call-out fees, no surprise bills.
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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 7 July 2026