Viessmann - D6 Error

connected to the boiler’s control system through an expansion module. While the boiler typically continues in "normal operation," it is alerting you that a peripheral component—such as a pump or a safety sensor—has encountered a problem. What the D6 Error Actually Means The D6 code is a communication signal within the Vitotronic control unit . It specifically identifies that EA1 expansion module has detected a fault from a connected device. Primary Cause: A fault signal from a device linked to the EA1 module. System Behavior:

Page 1 * Please file in Service Binder. * 5792 846 - 02 04/2025. * Part number: 7828749 Flow Sensor. for use with: Vitodens 100-W, Viessmann US Viessmann Fault Codes - FREE BOILER MANUALS viessmann d6 error

This article is for informational purposes only. Always follow manufacturer guidelines and local safety codes before servicing any heating appliance. connected to the boiler’s control system through an