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Vaillant error message "Con"?

My Vaillant EcoTec Plus isn't working. It jys flashes the message "Con" on the LCD panel. How do I fix this? Many thanks.
James, July 2010
CON on this boiler means ""communications error" look for a loose/disconnected wiring harness. If everything looks good get a engineer in. It will work out cheaper in the long run and will save you a lot of head scratching.

M, July 2010
Wrong Answer

the gasser, July 2010
condenshion trap blocked or full, check the out let outside is clear first, the the trap in the boiler.

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