Vaillant boiler won't fire up f21 -

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Vaillant boiler won't fire up f21

Discuss Vaillant boiler won't fire up f21 at the Central Heating Forum within the UKPlumbersForums; hello hope you can help, my combi boiler is not firing up, at first this was due to a loss of pressure which i rectified, ...

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28-12-2008	#1 (permalink)
russandsu Junior Member Info Join Date: Dec 2008 Posts: 1	Vaillant boiler won't fire up f21 hello hope you can help, my combi boiler is not firing up, at first this was due to a loss of pressure which i rectified, but now this morning won't fire up no matter how many times I 'reset'. There is a spark but no flame and error code f21 all the time. wondering is it the pcb? thanks guys...just noticed that the pressure has gone to the max...off the scale! in the red was in the green...bother! and has just started leaking water - had to turn offwater to the house! Last edited by russandsu; 28-12-2008 at 11:10 AM.

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