The display shows error code E: Communication error There is no communication between MCM unit and dome. Check the wiring between the MCM unit and the dome. By Henk de Goeij|2020-03-16T11:08:20+01:00October 29th, 2019|Categories: Malfunctions with Maritime system|Comments Off on The display shows error code E: Communication error Share This Story, Choose Your Platform! FacebookXRedditLinkedInPinterestVk About the Author: Henk de Goeij