What does Fault Code dA mean on my Viessmann B2TF Boiler?
If your Viessmann Boiler displays Fault Code dA, there is a short circuit in the room temperature sensor for heating circuit 1 (without mixer). Check the room temperature sensor for heating circuit 1.
What does fault code 20 mean on my Viessmann B2TF?
If your Viessmann Boiler displays Fault Code 20, there is a short circuit in the system flow temperature sensor. Check the low loss header sensor.
What causes fault code A7 on a Viessmann B2TF?
If your Viessmann Boiler displays fault code A7, it means the programming unit is faulty. Replace programming unit.
What does fault code bA mean on Viessmann Boiler?
If your Viessmann Boiler displays fault code bA, it indicates a communication error with the extension kit for heating circuit 2 (with mixer). Check extension kit connections and code.
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.
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.
What does fault code bd mean on a Viessmann B2TF Boiler?
If your Viessmann Boiler displays fault code bd, it indicates a communication error with the remote control Vitotrol heating circuit 2 (with mixer). Check connections, lead, coding address "A0" and remote control settings.
What does Fault Code dC mean on my Viessmann Boiler?
If your Viessmann Boiler displays Fault Code dC, there is a short circuit in the room temperature sensor for heating circuit 3 (with mixer). Check the room temperature sensor for heating circuit 3.
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 does Fault Code C5 mean on my Viessmann B2TF Boiler?
If your Viessmann Boiler displays Fault Code C5, there is a communication error with the variable speed internal pump. Check the setting of coding address "30".
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