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vaillant f28 error?

Hi

I have a Vaillent boiler which is showing an f28 error Can anyoe help?>
I Mathias, April 2010
clean it if not

smart, June 2010
typically F28 fault code, indicates a gas related problem...could be as simple as a lack of gas, to gas valve, board or lead.
Best to call their technical line!

ant, May 2010
link Click here to see other fixes for Vaillant.