Question
Can a blocked flue contribute to a Combi Boiler Error 118?
Asked by: USER5874
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Answer (58)
While less common, a partially blocked flue can disrupt the airflow and affect combustion, potentially leading to an Error 118. A blocked flue prevents proper ventilation and can cause incomplete combustion, making flame detection unreliable. A flue inspection is often part of a boiler service and error diagnosis.