on my vaillant boiler the pressure bar is on 0 and not moving and there is no hot water or heating and i do not know how to re- pressure it.there is a green light flashing on the display and it say's 65o but drops when i put the hotwater on in about 10 seconds and it is look warm water and goes cold. Can some one help me pls. i want to get a shower...

lisa, October 2008

what model valiant is it ? some older types have a simple silver metal hose beneath called a filling loop, and you have to open one or two small black plastic taps (one either end) of this hose, ( if no taps, could be screwdriver slots) and you will hear water coming into boiler. when your pressure reaches number one (bar) on boiler gauge, turn them off and it should work. if you dont have a silver hose, there will be a small plastic knob underneath the boiler behind a cover. if you have the boiler manual, it will tell you in there. if not sure, call a corgi plumber to look at it as you probably have a central heating leak somewhere (radiator? safety valve? expansion vessel?) to cause pressure loss in the first place.

mark. (oftec engineer), October 2008

You will have a small flexi pipe underneath the boiler connected to the cold water feed and it will link to the heating pipe.
There will be a small thumb size tap on the pipe, turn it on to put water into the system and once its reached about 1.5 bar turn it off, you might need to reset the boiler by turning it off and on again
Do not over pressure the system it can pop pipe joints etc.

Confused, October 2008