What does error code 125 typically indicate on a main eco compact boiler?

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Grade: Education Subject: Support
What does error code 125 typically indicate on a main eco compact boiler?
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Error code 125 on a main eco compact boiler usually signifies a problem with the boiler's flue or ventilation system. It often points to a blockage or insufficient airflow, which can be caused by debris, obstructions, or a faulty flue fan.