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 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.
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 Fault Code C3 mean on my Viessmann B2TF Boiler?
If your Viessmann Boiler displays Fault Code C3, there is an extension AM1 communication error. Check connections.
What does Fault Code db mean on my Viessmann B2TF Boiler?
If your Viessmann Boiler displays Fault Code db, there is a short circuit in the room temperature sensor for heating circuit 2 (with mixer). Check the room temperature sensor for heating circuit 2.
What does Fault Code dd mean on my Viessmann B2TF Boiler?
If your Viessmann Boiler displays Fault Code dd, there is a lead break in the room temperature sensor for heating circuit 1 (without mixer). Check the room temperature sensor for heating circuit 1 and remote control settings.
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