Poor combustion
Check flue terminal is not obstructed
https://letsfixit.co.uk/16085/boiler-error-codes-baxi-duo-tec-combi-he-error-code-e53/?utm_campaign=twitter&utm_medium=twitter&utm_source=twitter
Poor combustion
Check flue terminal is not obstructed
https://letsfixit.co.uk/16085/boiler-error-codes-baxi-duo-tec-combi-he-error-code-e53/?utm_campaign=twitter&utm_medium=twitter&utm_source=twitter