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Hi. My boiler has been flashing L9 then when I reset it it flashes 0 and then three horizontal bars. I cannot find this in the book. Does anyone know what it could be please? Neither CH or HW is working. It was intermittent but now cannot get it to work at all. Thanks. Sue.

Hi. Hubby is trying to fix a bell box. Can anyone tell me what these mean please and what type of circuit they would be on? RTN and TRG. Thanks.