home Fix label Heating label_important Home Heating Systems category Vaillant

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

home Fix label Heating label_important Home Heating Systems category Vaillantdone

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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home Fix label Heating label_important Home Heating Systems category Vaillant

my vaillant boiler is saying a code com on it ?

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my vaillant boiler is saying a code com on it ?

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