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error code 501

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    Ariston Clas HE 30 error code 501

    Hello, I am looking for some advice please. I have an Ariston Clas HE 30 boiler which is currently unable to detect the flame (error code 501). The first few times a reset managed to resolve the fault, but this no longer works. An engineer has suggested that there is a sub-board to the main...
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