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My Jaguar Combi Boiler keeps cutting out and the display reads 'F1'. What d?

What does 'F1' mean on a 28 KTVJ Jaguar Combi Boiler. It keeps cutting out and the landlord's plumber does not know what it means!
Geoff, July 2011
Low pressure in the boiler, needs topping up from mains

Roy, September 2011
link Click here to see other fixes for Jaguar 28 KTVJ.