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Mend Vaillant Saying Code Com

my vaillant boiler is saying a code com on it ?

what do I do when your boiler says com on it an no heating or hot water

mel
December 2016
VaillantHeating, Home Heating SystemsSaying Code Com
It refers to a communication fault between the two circuit boards, I believe the display actually reads CON? It could be a fatal board fault or a poor connection between the two, with the power off, try separating and reconnecting the boards

Carefree
December 2016
You do a Google search for - say "Valliant 'Model' Com Fault" but you replace 'Model' with the exact model number of your boiler.

XXX
December 2016
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how do I rectify the fault as detailed below?

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