BoilerFaultCodesBaxi 2 flashes red Fault Code
Also written as 2FLASHESRED — same fault.
The Baxi 2 flashes red fault code means: your boiler has shut down because it has detected it is getting too hot, likely due to a lack of water circulation or a blocked flue.. It appears on 4 Baxi models in our database.
Technical description: High temperature protection: Over-temperature thermostat on heat exchanger activated, No water flow through heat exchanger, Over-temperature thermostat fault or bad connection (open circuit), PCB over-temperature condition, Flue fault resulting in recirculation or activation of air pressure switch (if fitted)
DIY fix possible
Check that all radiator valves are fully open (at least two or three)Check that the external system pump is running if accessibleTurn the selector knob to the 'Reset' position for five seconds and release
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Baxi models that show the 2 flashes red fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Baxi 2 flashes red fault code information on this page is sourced and cross-checked against the official Baxi service / installation manuals for each affected model.
- Baxi 613 Heat manual (PDF)
- Baxi 800 Heat (range) manual (PDF)
- Baxi EcoBlue Advance Heat manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026