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why does f9 keeping flashing on my boiler, what does it mean?

my boiler is a saunier duval and it is not working at all. not the hot water or central heating. F9 keeps flashing. what does that mean and how can i fix it?

Salma
July 2009
Saunier DuvalHeating, Home Heating SystemsBoiler Hot Central
F9 depending on exact model of SD boiler you have generally indicates fault on water pressure sensor.
Check in your manual for the boiler, there will be a list of fault codes

Andy
July 2009

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