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If your Viessmann Boiler displays fault code 10, it indicates a short circuit in the outside temperature sensor. Check the outside temperature sensor.
What to do if Viessmann Boiler shows fault code b8?
If your Viessmann Boiler displays fault code b8, it indicates a lead break in the flue gas temperature sensor. You should check the flue gas temperature sensor.
How to fix fault code b0 on Viessmann B2TB004 Boiler?
If your Viessmann Boiler is displaying fault code b0, it means there is a short circuit in the flue gas temperature sensor. Check the flue gas temperature sensor.
What should I do if my Viessmann B2TB004 shows fault code b5?
If your Viessmann Boiler is displaying fault code b5, this indicates an internal fault. To resolve this, replace the control unit.
What does fault code b7 mean on a Viessmann B2TB004 Boiler?
If your Viessmann Boiler displays fault code b7, this indicates the boiler coding card is faulty. Try plugging in the boiler coding card, or replace it if it is faulty.
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.
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.
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 does fault code E0 mean on a Viessmann Boiler?
If your Viessmann Boiler displays fault code E0, it indicates a fault with an external LON subscriber. Check connections and LON subscribers.
What should I do if my Viessmann Boiler shows fault code dF?
If your Viessmann Boiler displays fault code dF, it indicates a lead break in the room temperature sensor, heating circuit 3 (with mixer). Check room temperature sensor for heating circuit 3 and remote control settings.
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