Viessmann Error Code D4: The Viessmann Boiler’s Error Code D4 means that the boiler is in emergency mode. This can happen if there is a problem with the internal bus connection or if there is an internal bus error. The boiler may also go into emergency mode if it has been running for more than 30 minutes and encounters a BUS error. In this mode, the boiler may not be able to function properly and may cool down. It is important to address this issue as soon as possible to ensure that the boiler operates efficiently and safely.
Viessmann Boiler – Error Code D4
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Viessmann Boiler – Error Code D4
Is your Viessmann boiler showing up with Error Code D4 on the screen? In this article, we’ll look at why it is happening, some potential next steps for fixing error code D4 and whether you should keep using your Viessmann boiler.
What is a Viessmann Error Code D4?
The Viessmann Boiler’s Error Code D4 means that the boiler is in emergency mode. This can happen if there is a problem with the internal bus connection or if there is an internal bus error. The boiler may also go into emergency mode if it has been running for more than 30 minutes and encounters a BUS error. In this mode, the boiler may not be able to function properly and may cool down. It is important to address this issue as soon as possible to ensure that the boiler operates efficiently and safely.
Recommended solution/fix steps
If you see the D4 error code on your Viessmann Boiler, it means that the boiler is operating in emergency mode or has cooled down. This could be due to an internal bus error or an open circuit internal bus connection. To resolve this issue, follow these steps:
1. Turn off the boiler and wait for it to cool down completely.
2. Check the internal bus connection for any loose or disconnected wires.
3. If you find any loose wires, securely reconnect them.
4. If the internal bus connection appears to be fine, try resetting the boiler by turning off the power supply for a few minutes and then turning it back on.
5. If the error persists, it is recommended to contact a professional technician or the Viessmann customer support for further assistance. They will be able to diagnose the issue accurately and provide the necessary solution.
Fault codes that are often associated with or mistaken for error code D4 are: D4, D0, B4, S4, DZ, B1, L4, 54, 86, i4
Can I still use my Viessmann boiler?
After encountering Error Code D4 on a Viessmann Boiler, the machine may still be operable. This error indicates that the boiler is operating in emergency mode due to an internal bus error or an open circuit internal bus connection. In emergency mode, the boiler may continue to function for up to 30 minutes before cooling down. However, it is crucial to address the underlying issue causing the error code to prevent further complications. Professional assistance should be sought to diagnose and rectify the internal bus error or open circuit internal bus connection. Ignoring the problem may lead to further malfunctions or potential damage to the boiler system.
