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Mend Vaillant VCW 242 EH Boiler Water Pressure

How do you top up the water pressure on a Vaillant VCW 242 EH?

I have located the cold water mains pipe, but cannot seem to get anything to happen when opening various valves. The guage is well below 0 at the moment, and there does not seem to be any water in the pipes. The kitchen taps appear to be working fine, so do not suspect mains supply issue. The boiler fan starts up etc, but the pilot light is not ingiting which I believe is due to the lack of pressure. Should I hear the water running in when topping up the system??? Please help!!

Jen
July 2007
VaillantVaillant VCW 242 EHHeating, Home Heating SystemsBoiler Water Pressure Vaillant
Hello,
Yes you should hear water running and must be careful not to leave the valve open. This is because it is a closed system and if you leave the valve open a little eventually the system will become full and over pressured. It should open the pressure relief valve at +3 bar and start kicking water out from below the boiler. Are you sure that there is not an open drain off some where? Also that the feed pipe is open at all points?

Alex
July 2007

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Vaillant VCW 242 EH: Low Pressure - How to Top Up