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How can I depressurise a boiler?

Fault because water pressure too high
Michael, December 2012
Drain out from drain out point or from radiator air vent

ltd, December 2012
Fill it with filling loop under the boiler ,valiant has build in loop so is vokera and others but most has boiler return and main supply to boiler fill to 1.2 bar

ltd, December 2012