What should I do if my Viessmann B2TF displays error code CE?
If your Viessmann Boiler displays error code CE, it indicates a communication error with the ext. extension. To resolve this, check connections and coding address "2E".
What should I do if my Viessmann B2TF Boiler 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".
What should I do if my Viessmann B2TF displays error code FF?
If your Viessmann Boiler displays error code FF, it indicates an internal fault or that the reset button R is blocked. Try starting the equipment again. If it will not restart, replace the control unit.
What causes fault code C3 on a Viessmann B2TF?
If your Viessmann Boiler displays fault code C3, it indicates an Extension AM1 communication error. Check electrical connections.
What does Fault Code dE mean on my Viessmann B2TF Boiler?
If your Viessmann Boiler displays Fault Code dE, there is a lead break in the room temperature sensor for heating circuit 2 (with mixer). Check the room temperature sensor for heating circuit 2 and remote control settings.
Why does my Viessmann B2TF Boiler show error code Eb?
If your Viessmann Boiler shows error code Eb, it indicates that heat draw-off is repeatedly too low during calibration. Initiate a heat draw-off. Switch the boiler OFF and ON again. Press reset button R. Set coding address 12:1. This special function leads to heat being transferred to the heating circuit during calibration.
What does error code F9 mean on my Viessmann B2TF Boiler?
If your Viessmann Boiler displays error code F9, it means the fan speed is too low during the burner start. To address this, check the fan, the fan connecting cables and power supply, and the fan control. Then, press the reset button R.
Why is my Viessmann B2TF Boiler showing error code C6?
If your Viessmann Boiler is showing error code C6, it indicates a communication error with the external variable speed heating circuit pump for heating circuit 2 (with mixer). To resolve this, check the setting of coding address "E5".
How to fix fault code bC on Viessmann B2TF Boiler?
If your Viessmann Boiler displays fault code bC, it indicates a communication error with the remote control Vitotrol heating circuit 1 (without mixer). Check connections, lead, coding address "A0" and remote control settings.
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