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Error message S.97, how can I fix this?

We woke up this morning to no heating or hot water. Error message shows S97 which after looking at the manual says that the pressure switch is faulty. How can I fix this or do I need to get someone out?
Joanne, February 2011
is it a vaillant ?? if it is it is the pressure switch,or the pressure vesel, or the pump ,the boiler has not seen the presure ,its to stop dry firing ,phil

philip, February 2011
link Click here to see other fixes for Worcester Bosch Greenstar.