What does error code b1 mean on a Viessmann B2TF?
If your Viessmann Boiler displays error code b1, it means there is a communication error with the programming unit. Check the connections and replace the programming unit, if required.
Why is my Viessmann B2TF Boiler showing error code A8?
If your Viessmann Boiler is showing error code A8, it indicates an air lock in the internal circulation pump or that the minimum flow rate is not achieved. If the fault message continues to be displayed, vent the system.
What does error code A9 mean on my Viessmann B2TF Boiler?
If your Viessmann Boiler displays error code A9, it indicates that the internal circulation pump is blocked. To resolve this, check the circulation pump.
What should I do if my Viessmann B2TF shows error code b7?
If your Viessmann Boiler shows error code b7, it indicates a boiler coding card fault. To fix this, plug in the boiler coding card or replace it if it is faulty.
What to do if my Viessmann B2TF displays error code bA?
If your Viessmann Boiler displays error code bA, it indicates a communication error with the extension kit for heating circuit 2 (with mixer). To resolve this, check the extension kit connections and code.
What does error code Ed mean on a Viessmann B2TF Boiler?
If your Viessmann Boiler displays error code Ed, it indicates an internal fault. To resolve this, replace the control unit.
What does error code F0 mean on a Viessmann Boiler?
If your Viessmann Boiler displays error code F0, it indicates an internal fault. To resolve this, replace the control unit.
What does error code b4 mean on my Viessmann B2TF?
If your Viessmann Boiler displays error code b4, it indicates an internal fault. To fix this, replace the control unit.
What does error code b5 mean on my Viessmann B2TF?
If your Viessmann Boiler displays error code b5, it indicates an internal fault. To fix this, replace the control unit.
What causes error code C4 on a Viessmann Boiler?
If your Viessmann Boiler displays error code C4, it indicates a communication error with the Open Therm extension. To resolve this, check the Open Therm extension.
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