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How to fix my 28i RSF boiler?

I recently moved to new house. I noticed a small leaking from the discharge pipe initially.
But now Water is flowing from the discharge pipe continuously.
its flowing even if I turn off power and water connection until the pressure gauge is .5

Center heating and hot water is working.

Pressure gauge bar normally showing 3.2 to 3.6.

Please advice
Roy, October 2013