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my conventional vaillant boiler flame wont stay lit...whats wrong?

water pressure was low...now refilled and sems ok...spark seen but no flame ..please advise
Dee Jay, December 2008
if it sparks but no flame the gas isnt get through by the sound of it.
model of boiler?

b, December 2008
link Click here to see other fixes for Vaillant ecoTEC.