What does error code E4 mean on my Viessmann B2TB004 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.
What to do if Viessmann B2TB004 Boiler displays fault code 38?
If your Viessmann Boiler displays fault code 38, it indicates a lead break in the boiler water temperature sensor. Check the boiler water temperature sensor.
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 d6 mean on a Viessmann B2TB004 Boiler?
If your Viessmann Boiler displays fault code d6, it means Input DE1 reports a fault at extension EA1. Remove fault at the appliance concerned.
What does fault code dE mean on Viessmann B2TB004?
If your Viessmann Boiler displays fault code dE, it indicates a lead break in the room temperature sensor, heating circuit 2 (with mixer). Check room temperature sensor for heating circuit 2 and remote control settings.
What does Fault Code b1 mean on my Viessmann B2TB004 Boiler?
If your Viessmann Boiler displays Fault Code b1, this indicates a communication error with the programming unit. You should check the connections and replace the programming unit if necessary.
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 does Fault Code bE mean on my Viessmann B2TB004 Boiler?
If your Viessmann Boiler displays Fault Code bE, there is a communication error with the remote control Vitotrol for heating circuit 3 (with mixer). Check connections, lead, coding address "A0", and remote control settings.
Why is my Viessmann Boiler showing error code C6?
If your Viessmann Boiler is showing error code C6, it indicates a communication error with the external variable speed heating circuit pump for heating circuit 2 (with mixer). To resolve this, check the setting of coding address "E5".
Why does my Viessmann B2TB004 display fault code b1?
If your Viessmann Boiler is showing fault code b1, there may be a communication error with the programming unit. To resolve this, check the connections and replace the programming unit if necessary.
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