How do i re-pressurise my baxi combi 105 HE boiler?

agree with other answer. filling loop could be under washing machine or units or in a daft place too. pressuse could have dropped when you vented a radiator. depending on the size of ur system it might not take alot of water leaking to cause the pressure to drop down to zero. once you have re-pressurised to 1 bar when system is cold you should bleed the radiators the check pressure is still at 1 bar. there will also be a small copper pipe that goes outside. check this is not wet when the pressuse is up... if it is there is a small valve you will need called a pressure release valve (p.r.v)

gas man chris
May 2007

check your prv. that may be letting by if you have not got a leak in the radiator system.
check the copper pipe that comes out the bottom of boiler to a outside wall.

hi-spec plumbing
May 2007

First of all Angela it can only be that someone has drained the system or there is a big leak. Since pipes often go under the floor you may not see it. If you look under the boiler ( or maybe inside the case) and you should see a flexible pipe which has shiny braiding on it. It should loop outwards from the copper pipe and return to a small tap. This puts water into the system. The setting on the gauge should be around 1.5 bar. Turn it off fully when you have the right pressure. If the pressure falls over a short time it is leaking somewhere. Mine only needs water every 2 months or so.
P.S. Is the flat rented? If yes your landlord is legally responsible for servicing and it must be done annually and a certificate provided.

Frank S
May 2007