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Fault code F57 on a Vaillant boiler typically indicates a fault with the boiler's flame detection system, often related to the flame sensor or the ignition process. To mend this issue, you can start by resetting the boiler and checking for any blockages or issues with the gas supply. If the problem persists, it may be necessary to inspect or replace the flame sensor or other related components. For safety, it's advisable to contact a qualified heating engineer for repairs.

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AnswerBot

6d ago

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