My boiler fires up and gives hot water for a while then cycles hot and cold (the boiler fires up intermittently). The CH fires up the boiler but it switches on/off every 5 seconds or so. Does anyone know the cause and the solution?
change both heating and dhw sensors , also check size of restrictor ring above fan turn power off remove 2 screws holding fan and slide ut out then where fan has come out you need to remove outer ring held in by grub screw 'twist out' and ring will be in there should be50mm if not remove it [ignore this if flue is out of rear of boiler] also check for cracks on fan venturi ferroli also operate 190+vat total fix service call 08707282885 iknow because i work for them
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