I wish to depressurise a Baxi 105 HE?

hi john you dont need to depressuise the boiler just turn off the radiator valves and undo the unions and drain it.when you refit the radiator fill the system with the filling loop near the boiler untill gauge reads 1 bar open the valves and vent till full then presurise till gauge reads 1 bar thats it

ajm heat
March 2009