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I have already posted similar responses to other users' queries but I will post here as well as this could save people a reasonable sum. Simply resetting the boiler won't resolve this issue. Instead, try the following. 1. Power off the boiler by pressing the power button on the front panel. 2...

My Vaillant boiler recently started displaying a message that said "Communication fault". I believe this shares the same underlying cause as the "CON ERROR". Resetting the boiler didn't resolve the issue but the following did: 1. Press the power button on the front of the boiler to turn it off...

Recently, my boiler started displaying a message saying "Communication Fault". I believe this shares the same underlying cause as the "Con Error". No amount of pressing the reset button seemed to clear the error. However, the following did work for me. 1. Press the power switch on the front of...