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home Fix label Heating label_important Home Heating Systems category Vaillant

what does con mean displayed on my vaillant boiler?

my vaillant boiler is displaying con what does this mean?
oliver, January 2011
home Fix label Heating label_important Home Heating Systems category Vaillantdone
Communication error between pcb and wiring looms, check that the connections are correctly plugged in

Carefree, February 2011
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