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Saunier Duval ISOMAX 28... FF 14...help?

Hi, My boiler cuts out when hot water has been running for approx 5 mins (i.e. when the shower is on). This cuts out the boiler and displays FF 14 and red light on the font of the display flashes. The boilerrestarts its self after a minute. any ideas anyone? Thanks..........

Dave B
February 2010
Saunier DuvalHeating, Home Heating Systems28 Boiler Water

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