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boiler starts up for 7 seonds and then stops ?

i fitted a service kit to my vaillant boiler a turbomax
as i had no hot water it cost £32 but fireing it up it runs perfect for 7 seconds then goes out on central heating and hot water is it , an air lock ????
danny, April 2010
could be ther is a auto air vent in the boiler could be turn off, BUT to get to this you need to be gas safe reg

erj, April 2010
link Click here to see other fixes for Vaillant.