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My Potterton Puma boiler is working but low water pressure light stays on?

Despite topping up the water pressure on my boiler till its just below 2, the low water pressure light has remained on. There is evidence of a slight water leak but with the gauge showing minimal reduction.Is it safe to keep using the boiler?
Neil, Motherwell, April 2009
i would get the leak checked but your problem is blocked water presure switch switch needs cleaning out or changing

steve b&h, April 2009
link Click here to see other fixes for Potterton.