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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

Vaillant Heating, Home Heating Systems Vaillant Boiler Panel

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

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Vaillant TurboMax + "F.28"?

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