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Vaillant TurboMax + "F.28"?

Help! Boiler has gone to lock out (red Light on front panel) and shows fault code "F.28", What does this mean? Any help would be appreciated.
James k, March 2005
Could be all of the above.
Do not attemt to restart.
Get expert help.
You could destroy the motherboard.

Rash, June 2010
same problem, need help

drednot, September 2007
Straight from the vaillant manual >F.28 means No gas;Insufficent gas ;incorect gas valve adjustment ; electrode defective ;ignition lead defect; Electronic ignitor defective,

Steve, March 2005
link Click here to see other fixes for Vaillant.