Why is my Viessmann Boiler showing fault code 30?
If your Viessmann Boiler displays fault code 30, this indicates a short circuit in the boiler water temperature sensor. Check the boiler water temperature sensor.
What does Fault Code b0 mean on my Viessmann B2TB004 Boiler?
If your Viessmann Boiler displays Fault Code b0, there is a short circuit in the flue gas temperature sensor. Check the flue gas temperature sensor.
What does fault code 20 on a Viessmann Boiler mean?
If your Viessmann Boiler displays fault code 20, it indicates a short circuit in the system flow temperature sensor. Check the low loss header sensor.
What does error code EA mean on my Viessmann B2TB004?
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 Cd mean on my Viessmann B2TB004 Boiler?
If your Viessmann Boiler displays Fault Code Cd, there is a communication error with Vitocom 100 (KM BUS). Check connections, Vitocom 100 and coding address "95".
What does Fault Code dA mean on my Viessmann B2TB004 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 C4 mean on my Viessmann B2TB004 Boiler?
If your Viessmann Boiler displays Fault Code C4, there is a communication error with the Open Therm extension. Check the Open Therm extension.
What to do if my Viessmann Boiler 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 causes fault code A7 on a Viessmann B2TB004?
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.
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