What the manual says
Manufacturer manualBoiler operating mode
From this model's manual
Verified against the Baxi 124 Combi Combi 2 installation & service manual.
DIY fix possible
Check if the room thermostat or programmer is calling for heatWait up to 10 minutes to see if the code clears as the boiler completes its cycleTurn the selector switch to 'Reset' for 5 seconds and then back to the original position
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