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Flashing?

Showing Bar 0.8, flashing F1, topped up system twice to bar 1.5 but keeps dropping, no leaks in systems, no radiators leaking
Any ideas
GLENn Overton, January 2010
assume its a combi? try seeing if the pressure relief valve is dripping outside where the boiler is located if so new prv helps if you state which boiler i may be able to help pinpoint if you give me as much info as possible

john, January 2010