What does fault code Cd mean on Viessmann VITODENS 242-F?
If your Viessmann Boiler displays fault code Cd, it indicates a communication error with Vitocom 100 (KM BUS). Check connections, Vitocom 100 and coding address "95".
Why is my Viessmann Boiler showing fault code C8?
If your Viessmann Boiler displays fault code C8, it indicates a communication error with the external variable speed heating circuit pump, heating circuit 3 (with mixer). Check setting of coding address "E5".
How to resolve fault code C7 on a Viessmann VITODENS 242-F?
If your Viessmann Boiler displays fault code C7, it indicates a communication error with the external variable speed heating circuit pump, heating circuit 1 (without mixer). Check setting of coding address "E5".
What should I do if my Viessmann VITODENS 242-F shows fault code C6?
If your Viessmann Boiler displays fault code C6, it indicates a communication error with the external variable speed heating circuit pump, heating circuit 2 (with mixer). Check setting of coding address "E5".
What does fault code C5 mean on a Viessmann Boiler?
If your Viessmann Boiler displays fault code C5, it indicates a communication error with the variable speed internal pump. Check the setting of coding address "30".
How do I fix fault code C4 on my Viessmann Boiler?
If your Viessmann Boiler displays fault code C4, it indicates a communication error with the Open Therm extension. Check Open Therm extension.
What causes fault code C3 on a Viessmann VITODENS 242-F?
If your Viessmann Boiler displays fault code C3, it indicates an Extension AM1 communication error. Check electrical connections.
How to troubleshoot fault code C1 on a Viessmann Boiler?
If your Viessmann Boiler displays fault code C1, it indicates a communication error with extension EA1. Check electrical connections.
What should I do if my Viessmann VITODENS 242-F Boiler shows fault code bE?
If your Viessmann Boiler displays fault code bE, it indicates a communication error with the remote control Vitotrol heating circuit 3 (with mixer). Check connections, lead, coding address "A0" and remote control settings.
What does Fault Code C3 mean on my Viessmann VITODENS 242-F Boiler?
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