My Vaillant VCW T3W boiler stopped working this morning. The pilot light is on but will not fir up when put on constant and I get no hot water. This happened a couple of weeks ago and the gas man said it was just low pressure and all we had to do was turn a couple of taps till the needs on the gauge were back together again. I have done this but nothing works still - HELP please!!!!!!

David Yule, March 2009