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how to reset a vaillant ?

i am on a card meter for my gas when asleep my gas ran out i have now put my emergency but the boiler is displaying f.29 how do i reset the boiler so it will work ?
robert, December 2012
reset the boiler by pressing the top left button under the display, the button has a flame with a cross through it. Turning it off and on as previously suggested will not work.

carefree, December 2012
Turn of boiler from main for 1mts restart boiler

ltd, December 2012
link Click here to see other fixes for Vaillant.