Why is my Viessmann B2TF Boiler showing fault code bb?
If your Viessmann Boiler displays fault code bb, it indicates a communication error with the extension kit for heating circuit 3 (with mixer). Check extension kit connections and code.
What does error code E5 mean on a Viessmann Boiler?
If your Viessmann Boiler displays error code E5, it indicates a fault with the flame amplifier. To resolve this, replace the control unit.
What does error code EA mean on my Viessmann B2TF?
If your Viessmann Boiler displays error code EA, it indicates that the ionisation current lies outside the permissible range during calibration. To resolve this, check the ionisation electrode and cable, and then press reset button R.
What does Fault Code d6 mean on my Viessmann B2TF Boiler?
If your Viessmann Boiler displays Fault Code d6, input DE1 reports a fault at extension EA1. Remove fault at appliance concerned.
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.
What does Fault Code E3 mean on my Viessmann Boiler?
If your Viessmann Boiler displays Fault Code E3, heat transfer is too low during calibration, and the temperature limiter caused a shutdown. Ensure adequate heat transfer and press the reset button R.
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.
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 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 does error code E4 mean on my Viessmann B2TF Boiler?
If your Viessmann Boiler displays error code E4, it indicates a fault in the supply voltage of 24 V. To resolve this, replace the control unit.
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