What are the potential causes for 'main eco compact error 133' related to flame sensing?

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Grade: Education Subject: Support
What are the potential causes for 'main eco compact error 133' related to flame sensing?
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Flame sensing issues leading to 'main eco compact error 133' can stem from a dirty or damaged flame sensor (also known as a flame ionization rod), incorrect positioning of the flame sensor relative to the burner, or a faulty connection to the control board. The sensor needs to reliably detect the flame to signal the boiler to continue operation.