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Pressure keeps building up within the system?

All radiators are bled within the system and are hot, however pressure keeps building up and the only way to reduce the pressure is to let off some water, what is causing the pressure to build up ?
Kathryn James, May 2008
filling loop left open
filling loop passing even though it appears off
holed heat exchanger allowing mains pressure into system

you never advised on boiler but they're the possabilities

iain, May 2008