First...I'm no plumber!
BUT on our 105E if you look under the boiler you will hopefully see 2 taps/valves joined by a flexible tube (silver?).
If these are there open one valve, then the other SLOWLY. You should hear the water going in. Watch the pressure guage and allow to pressurise to about 1 bar.
Perhaps after the boiler MAY need resetting as I believe they shut down when the pressure is about 0.5 bar.
Steve
March 2007