The EC has to do its own communication. It can issue letters to all owners or a newsletter or whatever. If there is a managing agent, the EC’s communications can be sent through that official channel. The contents can contradict the unilateral communications where they were wrong, or even explicitly ‘correct an impression that an earlier letter represented the views of the EC as a whole’. The EC needs to agree on the text of each communication and have a quiet word to the managing agent about what it going on. The rest of the EC can just persistently outvote the one member of the EC. It is annoying when this happens but the majority have the power. Owners will quickly work out that the unilateral communications were not the endorsed position of the EC.