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usalazarAug 30, 2025
What causes fault code C3 on a Viessmann B2TB004 Boiler?
- MMrs. Barbara RoseAug 30, 2025
If your Viessmann Boiler displays fault code C3, it indicates an Extension AM1 communication error. Check electrical connections.
To Next PageTo Next PageWhat causes fault code C3 on a Viessmann B2TB004 Boiler?
If your Viessmann Boiler displays fault code C3, it indicates an Extension AM1 communication error. Check electrical connections.
What to do if Viessmann B2TB004 displays fault code A9?
If your Viessmann Boiler displays fault code A9, it indicates that the internal circulation pump is blocked. You should check the circulation pump.
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 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.
How to fix fault code CF on Viessmann Boiler?
If your Viessmann Boiler displays fault code CF, it indicates a communication error with the LON communication module. Replace the LON communication module.
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 E3 mean on my Viessmann B2TB004 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 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.
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 4C mean on my Viessmann Boiler?
If your Viessmann Boiler displays Fault Code 4C, there is a lead break in the flow temperature sensor for heating circuit 3 (with mixer). Check the flow temperature sensor.
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