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Gas Boiler Pressure Limits?

My boiler has dropped pressure, I have increased it using the valve but it has gne over 2, someone said you should have it between 1 and 2. Is it dangerous to use if over 2, and what would happen if left on?
Mary O'Leary, December 2007
Mary you let some of the pressure off by bleeding off one of the rads

baz, December 2007